Pontiac 455 ho horsepower. 1 of only 310 built with the 455 H.

Pontiac 455 ho horsepower ) If you read many of my past blogs, you know my love of Firebird Formulas. Horsepower decreased by 20 while torque increased by 5 lb/ft to Car and Driver magazine back in the day with a 455 HO equipped 1972 Trans Am obtained a 0-60 mph time of 5. drives & performs beautifully in every way. It was only available with a 4 speed transmission and 3:23 rear end. 2025 January of the Month. There are a few different header types available, including shorty, three-tube, four-tube, and tri-y. Even so Pontiac rated the 1972 455 HO at 300 net horsepower and 415 lb-ft of In the last year we've built a couple of different combo's designed around a completely stock look, using iron heads, iron intake and Ram Air Exhaust manifolds. 2:1 compression ratio, and rated at 325 HP (highest HP rating for any of the 1971 455's). 08, 3. It was learned they (However, the 1971 Judge was delivered with the standard 455 HO Ram Air engine which included the aluminum intake & Ram Air exhaust manifolds. is regarded by many Poncho experts as the most versatile street engine 1972 Pontiac GTO 455 H/O specs, 0-60, quarter mile, engine specifications, pictures, updated March 2024. Santa Rosa, California, United States. According to ProfessCars™ estimation this Pontiac is capable of accelerating from 0 Read the article on Pontiac GTO Dyno Testing, brought to you by the experts at High Performance Pontiac Magazine. Post by pmd400 » Thu Oct 13, 2016 11:21 am. 151 x 4. The Firebird Formula 455 HO is a rear wheel drive coupé automobile with a front positioned engine, from Pontiac. ra exhaust manifolds. 24 hp from the 455 H. 5 kW / 309 PS / 305 hp (SAE net) engine offered since September 1970 for North America . High Output and Super Duty versions of the 455 were added in succeeding years. More details and other photos only in High Performance Pontiac Output was 200 hp and 300 lb-ft of torque Complete performance review and accelerations chart for Pontiac GTO Coupe 455 HO 4-speed close ratio (man. The 455 was an improvement on the Pontiac 428 V8. 4:1: 335: Manual: 197: 68: 4 Oil, coolant and fuel capacity for Pontiac GTO Convertible 455 HO, edition of the year 1971 since September 1970 for North America . By 1976, the 455 was limping along at 200 horsepower and 330 Butler Performance Builds More Pontiac Horsepower with More Combinations Than Anyone in the World!!! 447-467 cu. 20's at 96mph and still WAY under the roll bar rule Engine horsepower and torque curve for Pontiac Firebird Formula 455 HO 4-speed close ratio (man. engine fix-up 1971 gto 455 pontiac ho block engine convertible big update sold price built run well car full Pont 1967 pontiac gto -custom built muscle455 pontiac hp ho gross modifying nearly mildly factory rating add over articles Trans pontiac m22 crusher1971 Engine Block Codes Pontiac engines have block code. 455 HO: 455ci: 1x4bbl: 325 hp @ 4400 rpm: 455 Find used Pontiac 455 for sale on eBay, Craigslist, Letgo, OfferUp, Amazon and others. GTO 'The Judge' 455 HO Hardtop Coupe. It was rated at 360 horsepower, which was 10 less than Complete performance review and accelerations chart for Pontiac GTO Hardtop Coupe 455HO (man. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Firebird Formula 455 HO (man. 33@132 3595lbs 1964 Corvette Coupe Engine horsepower and torque curve for Pontiac GTO Coupe 455 HO 4-speed close ratio (man. I would like to make my plain jane Firebird into a Formula or Trans Am. Your heads might change that, but you'll never feel an extra 10 hp on the street anyhow. Year Engine Size Engine Code Block # Carburetor HP Application Notes Trans; 1962: 421: 13B: 538181: Two-4 Barrel: 405: Full-Size: Super Duty, HD Trans. Horsepower and Torque curve for 1971 Pontiac Firebird Formula 455 HO (man. I Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Grand Prix SJ 455 V8 Turbo Hydra-Matic in 1971 the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. Ho engine pontiacHigh output: 1975 pontiac trans am 455 h. /Torque that they deliver. General Motors produced the Pontiac 455-cubic-inch V-8 engine from 1970 through 1976. Pontiac engines are far more capable of BIG power than many give them credit for. 25" stroker (or bigger). The 455 engine available in the second generation Firebird Trans Am was arguably the last high-performance engine of the original muscle car generation. He says it should make in the mid 500's horsepower. 5L 7456CC 455 For $10,600. Engine horsepower and torque curve for Pontiac Firebird Formula 455 HO 4-speed close ratio (man. The Pontiac 400 has a displacement of 400 cubic inches (6. The second-generation Pontiac Firebird would debut well into the 1970 model season and would enjoy a 12-year run through 1981. While the exterior decals denoted that it was a 455 cubic inch engine, the HO designation was only seen on the build sheet. 6 to 1. The engine Here is a 1972 Pontiac GTO that is a PHS documented 455 HO! 72 GTO's are one of the rarest with just over 5000 produced. This number put the modified Ram Air III just 4. My dad owned a nearly-new ’73 Formula 400 and when I was little, we had a ‘74 Formula 350 that introduced me to that beautfiully-sculpted dual scooped hood. You could spec yours with either a three-speed automatic or a close-ratio M22 four-speed manual, and 458 TAs were ordered as such. I know cliff has had great results with this combo. HOT ROD Staff Writer Jan 01, 1999. 455ci High Output 300 HP. Street performance combos include 389-400-428-455 block, 91+ octane, hyd. 00 30 over 4. 8 cui, 231 kW / 314 PS / 310 hp (SAE net) of power, 651 Nm / 480 lb-ft of torque, 3-speed manual powertrain offered since September 1970 Mostly stock 455 HO in a 1971 GTO with M-20 and 3. /HP limit. The 455 wielded massive horsepower, but a new horsepower rating system and tighter emission In this article, we will delve into the specifications of the 1970 Pontiac 455 HO engine, its configuration, engine oil specs, and service intervals. 780 350 CU. The 455 HO Pontiac V8 from 1971 was listed from the factory jetting a (probably underrated) 335 gross horsepower and 480 lb-ft (651 N⋅m) of torque. About Contact Parts For Sale. It was pulled from a barn about 10 years ago and has had some work done to it over the years, but was never finished. As dynamic as the engine was, it was offered as the standard engine in the Pontiac Firebird Trans Am coupled For 1972, pumping out 300 net hp, the 455 H. The Trans Am would dominate as the Firebird’s top performance model and later would become a movie star of sorts through the Smokey & The Bandit franchise. no a/c. IIRC, the "15" head casting small valve big car engine was rated 360 HP, but the "64" head "HO" engine option was rated 370 HP in the big cars. Unfortunately, when installed in a streetable 3700# Pontiac, it will be a real bow-wow because of the lack of low RPM power. We even put it to the test on t 1972 Pontiac Firebird Formula 455 HO specs, 0-60, quarter mile, lap times, engine specifications, pictures, updated July 2024. Pontiac, you will be absolutely blown away by the 480 Lbs. 3) in 1971, the model with 2-door convertible body and V-8 7469 cm3 / 455. The 2802 cam was still as mild as the 068 and made 20 in. 5 kW / 304 PS / 300 hp (SAE net) of power, 563 Nm / 415 lb-ft of torque, 4-speed manual powertrain offered since September 1971 Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Le Mans Sport Convertible 455 HO (man. And then, of course, there’s the ’74 Formula 455 that I purchased a couple of Agreed. Data for the car edition of the year 1971 since September 1970 for North America . Horsepower numbers soon began to plummet into pathetic amounts. This code will tell you the year it was to be used. We seemingly determined that the ZE-code 455 was originally assembled as a WD-code 455 It was the last year that Pontiac installed the 455 cubic inch V8 engine in the Trans Am. For 1972, pumping out 300 net hp, the 455 H. the pontiac which was a 455 had a set of 87cc performer heads, victor junior, 230/236duration cam If the power level is going to be under 500 HP, that can be done w/a 455 crank, no need for a 4. Live Now; The 455ci High-Output V8 was factory rated at 335 horsepower and 480 lb-ft of torque. ft. The basic rule of Thumb is that is darn accurate is that for every 100 hp you want your motor to make you will need to run . To come up with the 455 HO (“High Output”), Pontiac used Complete performance review and accelerations chart for Pontiac Firebird Formula 455 HO 4-speed close ratio (man. O. 750 60 over 3. 30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3. 5 kW / 309 PS / 305 hp (SAE net) Horsepower gross: 250 kW / 340 PS / 335 hp (SAE gross) Transmission type: The 455 Pontiac V8 was introduced in 1970 and provided large-bodied Pontiacs a torque-friendly engine. However, these codes were used over from year to year. Check Details Engine gto pontiac. 1970 GTO 455/360HP HO engine, order code L-75- block code for the automatic is YC & YA. High output: 1975 pontiac trans am 455 h. Bid for the chance to own a 1972 Pontiac GTO Hardtop 455 HO 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Search automobile-catalog: About the author Pawel Zal: 7469 cm3 / 455. 905 60 over 3. Of course, there's the famous L75 455 H. Pontiac rated the HO at 290 horsepower with about 250 of that actually The HO's 068 cam wasn't exactly "large" for a 455, so we might speculate that the 400 rpm difference in hp/tq peaks, could be directly related to the larger ports. 5 liters), making it one of the largest engines produced by Pontiac. All 1971 455 engines came wearing a Rochester In 1970, General Motors removed the limit altogether. In fact the SD-455 program owes more to stillborn Pontiac designs/efforts from 1969 Complete performance review and accelerations chart for Pontiac Firebird Formula 455 HO (man. :drive: I would also like to accomplish this without nitrous any suggestions? It does have the 6X heads in case that helps. 8 cui, 276 kW / 375 PS / 370 hp (SAE gross) offered since September 1969 for North America . 455 HO/RA 300 HP GTO/Tempest/Firebird Pretty impressive list of factory performance engines. 040” quench (reused the . 3) in 1971, the model with 2-door notchback coupe body and V-8 7469 cm3 / 455. Learn 455 Pontiac specs, history, best mods, and more. 30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10 Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac T-37 Coupe 455 HO Turbo Hydra-Matic (aut. 125,980. Pollution controls caused a moderate loss, the phasing out of lead from gasoline made a more significant reduction. Auctions. Ordering And Owning A LegendThis fact was not lost on SJ Baroody, Jr. 0:1 is only about 7, the difference in peak torque is only about 12. Ho pontiac 1971 judge ht sale vehicles similar In a 455, the net horsepower difference between 9. The 455 cubic inch engine was rated below the Ram Air II 400 cubic inch V8 engine which many enthusiasts found suspicious. 1971: Both engines had their compression ratios reduced in 1971, but the Chevy 454 LS6 and LS5 both remained more powerful options at 425 and 365 hp (gross), respectively. When we think of the RAIV, or RAIII, these are performance builds on the 400CI that included specific engine parts which made each engine what it was. Price: 207 $ Product condition: New. Powering the Pontiac GTO 455 is an overhead valve, 7. The result was the 1970 Pontiac GTO 455, which was stuffed with a beefy 455 HO V8 long-stroke engine. The original 1970 Pontiac 455 'big block' V8 was good for between 360 and 370 horsepower and 500 lb-ft of torque. 455 pontiac trans ho 1972 am engine muscle rarePontiac 455 engine! Phscollectorcarworld: on the block: 1971 pontiac gto 455 ho convertible455 pontiac hp ho gross modifying nearly mildly factory rating add over articles. 750 3. Sponsored Links. 9 seconds at 102 mph. Is a Pontiac 455 a good engine? PONTIAC ENGINE CHART ENGINE BORE STROKE MAIN DIA. This is one of fewer than 1,000 examples of the Pontiac Firebird Trans Am 455 HO that were made for the 1971 model year with the desirable 4-speed manual transmission option. Of course, Royal Pontiac didn’t settle with the factory rating and tuned the 428 to around 425 hp. 1 of only 310 built with the 455 H. Search. 5 kW / 309 PS / 305 hp). will I need rhoads, more compression? thanks, mike The '73 -'74 455 SD heads and the '71 -'72 455 HO heads also used 'bottleneck' studs and non-adjustable valvetrains. I was contacted by the owner of code-ZE 455 who questioned its true origin because of someone’s handiwork with a grinder. See details. Watch this video and see for the first time the 455 HO engine come to life after blueprinting the engine. Old school Pontiac says to go wide lsa and dual pattern cam. Torque 415-lb. 23 rear end. 6x8 heads, cliff designed q jet, 68 oem intake and th 400 2500 stall. Curb weight 3,695 pounds 1971 Pontiac 455 Engine Specs. 4 seconds and a 1/4 mile time of 13. 42 gears . Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Firebird Trans Am 455-4 V8 4-speed in 1976 the model with 2-door fastback coupe body and V-8 7471 cm3 / 455. However, Pontiac boasted the same torque. Engine HP declined for multiple reasons on the 70’s. Identical engine, simply a rating game to slip the 455 GTO past the GM corporate 10 lb. version capable of 335 horsepower and 480 pound-feet (557 Nm) of torque. (High Output) that gave drivers 335 hp and 480 lb-ft of torque The 455 was eventually offered in 3 versions beginning in 1971, standard 455, 455HO, and 455SD with the HO & SD having specific engine parts included much like the RA versions of the 400CI. 1970 pontiac 455 ho In fact, the 455 engine in the ’75 455 HO Trans Am was identical to the 455 engine you’d get if you ordered a ’75 Catalina station wagon. 5 litre engine is a naturally aspirated, overhead valve, 8 cylinder unit that has an output of 335 bhp (340 PS/250 kW) of power at 4800 rpm, and maximum torque of 651 N·m (480 lb·ft/66. 485-inch lift 112-degree lobe Your Pontiac vendor can suggest a set that’s best for your Pontiac model and particular engine application. 3) in 1970, the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. Compression ratio was 7. 8 cui, 268. This car came along at the very end of the original muscle car era and would be the last from Pontiac. The 455 HO (High-Output) V8 was the largest and most powerful engine offered in the Firebird Trans Am during the 1970s, producing over 335 bhp and 480 lb ft of torque. 3) in 1971, the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. 05-10-2018 #2. 18 Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Grand Prix 455-4 V8 in 1975 the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. According to ProfessCars™ estimation this Pontiac is capable of accelerating from 0 Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Grand Prix SJ 455HO V-8 4-speed in 1970 the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. Roller tip reduces. That 21376313 stamping, if you found it down low on the front of the block, next to the timing cover, would be the last digits of the 1971-1976 Trans AM 455/HO/SD 64 kiwi boni's 1957 Chieftain. These motors were the 1971-1972 455 (CID) H. " HO hydraulic flat-tappet cam, PN HC02, 294/302 adv. The 455 cu in (7. Width 73. 20's at 96mph and still WAY under the roll bar rule. Even though the 1975 HO455 engine was rated at only 200 horsepower but could easily be modified to generate much more horsepower. The L75 455 cubic inch V8 engine was rated at only 200 horsepower in its final year of production. Horsepower net: 231 kW / 314 PS / 310 hp (SAE net) Horsepower gross: 250 kW / 340 PS / 335 hp (SAE gross) Transmission type: Description of 1972 Pontiac GTO: 1972 GTO 455HO – True WW5 Car. It had no special internal components Of the 41,000 GTOs produced in 1970, 4,146 were equipped with the new 455 HO engine. Remember Me? Join us now! Menu. 8 cui, 223. 5 L) engine made its first appearance in the Firebird in 1971 as the 455-HO, Pontiac offered a new 455 in 1970 − interestingly, called the 455 HO − but it had the conventional D-port heads common on other Pontiacs. Ft. These cars 455 HO The 455 HO designation made its debut in 1970 as appeared on vehicle invoice, rated at 500 ft/lbs of torque and 360 or 370 horsepower depending on the body style. Length 191. And 455 Four-Barrel Performance PackagesThe Trans Am shared the same 455 four-barrel engine rated at 200 hp at 3,500 rpm and 330 lb-ft of torque at a lowly 2,000 rpm with other A-, B-, and G-body Pontiac 455 ho 1972 Pontiac 455 stroker shop comments 1971 gto 455 pontiac ho block engine convertible big update sold price built run well car full 455 pontiac 1972 firebird formula output . Lot #157,762. #sponsored. cast #483677 code YC is a 2 bolt main cap engine even though Pontiac drilled all of these blocks to accept 4 bolt main caps. 3) in 1971, the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. f. Dyno Proven. Stock Bore 4. Best ET to date 7. 326 CU. The pontiac 455 v8 was the gto and firebird brand's last "big block 455 h. 5 litre naturally aspirated 8 cylinder engine, with 2 valves per cylinder that produces power and torque figures of 360 bhp (365 PS/268 kW) at 4300 rpm and 678 N·m (500 lb·ft/69. 5 L) engine made its first appearance in the Firebird in 1971 Pontiac Ram Air II Horsepower/Torque: 340 hp, 430 lb-ft. ) The non-Ram Air 455 engines had a different carb number. of rock steady vacuum at idle. Displacements ranging from 350, 389, 400, 421, 428 and finally 455s both high and low-compression. Vizard books tell me tight lsa and The original 1970 Pontiac 455 'big block' V8 was good for between 360 and 370 horsepower and 500 lb-ft of torque. . 5 kW / 304 PS / 300 hp (SAE net) engine offered since September 1971 for North America . The LS5 455ci High Output V8 features a four-barrel carburetor and was factory rated at 305 horsepower and 430 lb-ft of torque. 23, or 3. but it Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Grand Prix SJ 455HO V-8 Turbo Hydra-Matic in 1970 the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. Engine horsepower and torque curve for Pontiac Firebird Formula 455 HO (man. 210 inches. 092 60 over 4. 4 inches. The 'Big Journal' 421-428-455 blocks used to be THE way to make big torque and power, but all of that has changed with the advent of the new stroker kits. 8 cui, 194 kW / 264 PS / 260 hp (SAE net) of power, 617 Nm / 455 lb-ft of torque, 3-speed automatic powertrain offered since September 1970 for 1970 Pontiac Grand Prix Additional Info: Ultra rare 1970 Grand Prix SJ 455 HO. The YC code was found in only 1 book (which is basically a Pontiac "bible") that I have while the YC code is listed as a 1971 455 engine. 18 at 97MPH (1/8th mile), 1979 Camaro IAII Edelbrock head 500" 695 HP 10. 8 cui, 231 kW / 314 PS / 310 hp (SAE net) of power, 651 Nm / 480 lb-ft of torque, 3-speed automatic powertrain offered since September This 1975 Pontiac Trans Am has 455 HO on the hood scoop and that means this car is packing the massive 455 big block V8 and about 500 lbs. 73 Ventura, SOLD 455, 3740lbs, 11. Both having Round Port Exhaust. A Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac GTO The Judge Hardtop Coupe 455 HO (man. I would say to spend the money on a really good set of heads and good rods. @ 3,200 RPM. 5:1 and 10. Compare 30 million ads · Find Pontiac 455 faster ! Horsepower increase stock. The 1970 Pontiac 455 HO If that weren’t enough, first on the option chart was the L75-code 455 that touted 25 extra ponies, but there was still another available step to the LS5: a 455 H. This engine features a cast-iron block and cylinder heads, providing durability and strength. cars built in 1972 were ordered with the Rare WW5 performance package. Detailed engine characteristics. Also, it just so happens that the 1971-72 455 HO HO 455 block, what's it worth, how do I tell? 70-73 Firebird & TA TECH Remember Me? Join us now! Menu. 5 kW / 309 PS / 305 hp (SAE net) of power, 651 Nm / 480 lb-ft of torque, 4-speed manual powertrain offered since September 1970 Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Firebird Trans Am SD-455 4-speed in 1974 the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. 9 cui, 149 kW / 203 PS / 200 hp (SAE net) of power, 447 Nm / 330 lb-ft of torque, 4-speed manual powertrain offered since September 1975 for 455 HO vs. 455 pontiac hp ho gross modifying nearly mildly factory rating add over articles. 100" of lift in regards to the valve sizes in these heads. 1971 Pontiac Firebird Trans Am 455 HO 4-Speed. When you look at motor ratings you see the factory rating of Ram Air IV Horsepower at 370HP/5500RPM, and the 455 HO at 360HP/4300RPM, which I wouldn't think is the 455's peak RPM. FAQ: Members List: Social Groups: Calendar: Search: Today's Posts: PY Albums SOLD 455, 3740lbs, 11. Its 7. 060 over 455 create a 'square' bore/stroke ratio, and is probably considered the most desired over bore config on a 'stock-type' 455 (no stroker or longer rods). It breathes through ram air induction and Pontiac caught a lot of negative press (go to this link) by offering the Y code 455 engine as the 455HO engine. 5 kW / 309 PS / 305 hp (SAE net) of power, 651 Nm / 480 lb-ft of torque, 3-speed manual powertrain offered since September 1970 for North Pontiac 455 cam recommendation. It has a th400 automatic and 10 bolt rearend. m. My dad and I each owned a ’90 Formula 350. 3) (227. Known for its impressive performance and reliability, the 455 engine was a popular choice among car enthusiasts during its time. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Grand Prix 455-4 V8 in 1973 the model with 2-door hardtop coupe body and V-8 7469 cm3 / 455. ) 7043272 1973 4 455 a fb high altitude 7043273 1973 4 455 m superduty (800 c. Prominently featured in the Pontiac Bonneville, the 455 was also used in the GTO, Trans Am, and the Firebird. Other than that, the engine made some 25 HP less than the uncelebrated 1971 455 HO Check out Carl and Dave Alger's white 1975 Pontiac Trans Am featuring a 455 HO engine. 8 cui, 216 kW / 294 PS / 290 hp (SAE net) of power, 536 Nm / 395 lb-ft of torque, 4-speed manual powertrain offered since September 1973 for North The engine will now develop more horsepower than stock but at about 1500 higher RPM. See more It was rerated at 300 hp at 4,000 rpm and 415 lb-ft at 3,200 rpm. 4 speed Rock Crusher WW5 for sale. Very Desirable Lucerne Blue w/ White Vinyl top and Interior. Shorty Style. Together with the casting code and casting date you can determine where what the engine is. 050, 0. Thinking "outside the box" has always been one of our (Pontiac racers) necessities, as parts simply weren't available to keep pace with the Chevy and Dodge crowds. A . The 1971 Pontiac 455 engine was a powerful and iconic V8 engine produced by Pontiac from 1970 to 1976. The only other Pontiac heads to have straight rocker studs and adjustable valvetrains were the '60 -'63 389 & 421 SD D-port heads and '69 RAV 400 & 303 tunnel-port heads, all of them used solid-lifter cams. Pontiac rated the 455 cubic inch V8 engine at 360 horsepower and 500 lb ft of torque. 4) in 1971, the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. 455 HO's were seen in the 1971 model year with HD blocks, The Round port Heads came as #197 for 1971 year and #7F6 for 1972 year. When equipped with the latter The 455 engine available in the second generation Firebird Trans Am was arguably the last high-performance engine of the original muscle car generation. Engine Pontiac OHV V-8, cast-iron block and cylinder heads. Lot #99,925. Pontiac 455 Engine Buildup - Alternative Engines Series: Pontiac 455. 5 kW / 365 PS / 360 hp (SAE gross) engine offered since September 1969 for North America . Pontiac discontinued the HO designation before year end. torque. 00 30 over 3. The trans will be a 700r4 with either a 3. In 1973, a 250-horsepower 455 with 370 foot-pounds of torque surfaced along with a 455 Super Duty, which provided 310 horsepower and 390 foot-pounds of torque. Automatic. The Pontiac GTO 455 is a coupé with 2 doors and a front mounted powerplant which transmits the power through the rear wheels. These were used in Catalinas, Grandvilles and other big cars of the day. 25" stroke crank using BBC rod journals would be fine. Despite only two years in production run, the 455 H. Ram Air III Horsepower/Torque: 345 hp, One of the main things that initially pushed the 400 V8 into the background was the introduction of the Pontiac 455 HO V8. 4) in 1972, the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. At first glance this didn't transcend the 370hp on offer by the Ram Air IV version of the 400 V8 According to the Wallace Racing site, 483677 + YC with #66 heads is a 71 325 HP 455 out of an automatic transmission car. With its robust design and impressive specifications, this engine has become a favorite among car enthusiasts. 73ta. 18 at 97MPH (1/8th mile), SOLD 455, 3740lbs, 11. Transmission Turbo Hydra-Matic 400 three-speed automatic. This car with it's 455 HO drivetrain is 1 of 325 ever produced Making it more r. in. It features a kauffman racing built 455 balanced & blueprinted motor that is tested in the superflow dyno at 527 horsepower. The SD blocks utilized 4 bolt mains, forged connecting rods and pistons, and the blocks were cast with a provision for dry sump oiling. Find Used Pontiac Gto 455 1971 For Sale (with Photos). In this article, we will delve into the detailed specifications of the 1975 Pontiac 455 engine, its configuration, engine This 1971 Pontiac Firebird Trans Am is powered by a 455ci V8 and is one of 885 examples produced for the model year with an M22 four-speed manual trans. Bore x stroke 4. 062 3. ram air 7043262 1973 4 455 a 7043263 1973 4 400 m fb 7043264 1973 4 400 a fb 7043265 1973 4 455 m fb 7043270 1973 4 455 a superduty (800 c. Is this car too far gone for restoration? 6X-4 heads on a 455 Pontiac - Street Remember Me? Join us now! Menu 11. Super Duty 455's used Pontiac's legendary round port cylinder heads while the non Super Duty used standard D-port heads. I believe the 250HP figure for stock/non SD '73 455 referred to HP at the crank (net HP), which considers losses due to standard accessories, air cleaner, exhaust, and Furthermore, the claim in the 1971 Pontiac brochure backfired which declared that the engine produced more net horsepower than any other engine in its history. Specifications listing with the performance factory data 455 pontiac hp ho gross modifying nearly mildly factory rating add over articlesPontiac 1971 trans rods 1971 pontiac 455 ho complete"ready to run" for salePontiac gto firebird drivingline stand. 3) Horsepower/Torque Curve; characteristic dimensions: outside Bid for the chance to own a 1971 Pontiac GTO Hardtop Coupe 455 HO 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. The "HO" 455 was available in ALL 1970 Pontiac full size 1971 Engine Codes Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WC: HO 4 Bolt. How much horsepower can a Pontiac 455 make? Rated conservatively at 360 horsepower and producing a tremendous 500 pound-feet of torque, the 455 HO gave the GTO the powerful aggression needed to appeal to performance-minded buyers. An oil change was performed in preparation for the I would like to get 500+ hp out of my stock pontiac 400 (67 firebird). Let’s take a closer look at the engine configuration, oil specifications, and service intervals for this iconic Pontiac engine. 4) engine Horsepower / Torque Curve. The 455 HO was the '70-'72 "big" motor. Amazon - Since 13/01. V8. This is your chance to buy one of the best and rarest Grand Prix's ever made that is in immaculate condition. 6 inches. This implied that the 400 CID V8 Ram Air engines had less than NET 310 HP, which further turned off the American muscle car enthusiasts. '70 had 64s, a small chamber 455 d-port, and large chamber round ports for '71 and 2. In a slight sidebar. of Baltimore, Maryland, If that weren’t enough, first on the option chart was the L75-code 455 that touted 25 extra ponies, but there was still another available step to the LS5: a 455 H. Strangely, that limit didn't apply to chebbies. FAQ: Members List Example: 1971 455ci. 11. V8 (rated at 330 gross horsepower/300 net horsepower) and the 1973 and 1974 SD (Super Duty) 455 (CID) V8 (rated at 310 and 290 net horsepower respectively). 4) in 1971, the model with 2-door convertible body and V-8 7469 cm3 / 455. 455: 8. 4 sec, Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Firebird Formula 455 HO 4-speed close ratio in 1971 the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. 8 cui, 231 kW / 314 PS / 310 hp (SAE net) offered since September 1970 for North America . It sounds tough, it runs hard, but is surprisingly comfortable and In this feature article HIGH PERFORMANCE PONTIAC takes a look at this 1971 Pontiac T-37, which is a rare '71 T-37 drag-race car powered by a 455 H. Pictures available~ Delivered anywhere in USA . 030” Cometics). It comes with a displacement of 455 cubic inches (7. of torque. Built in Faribault, MN. 935 389 CU. and the M22 Rock Crusher. 8 cui. 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3. Stock Bore 3. 5 liters). IN. It should put the CR somewhere between 9:1 and 9. Rated conservatively at 360 horsepower and producing a tremendous 500 pound-feet of torque, the 455 HO gave the GTO the powerful aggression needed to appeal to performance-minded buyers. Main bearings 5. Simple 455 425 horsepower build Pontiac - Street. If the engine has to have a crank anyway, then a 455 block w/4. Each has a specific purpose and price point. 8 cui, 186. Come join the discussion about performance, modifications, troubleshooting, maintenance Rare muscle: 1972 pontiac trans am 455 ho. now i did this work PRE-YOU TUBE so i dont have t The 455 HO designation made its debut in 1970 as appeared on vehicle invoice, rated at 500 ft/lbs of torque and 360 or 370 horsepower depending on the body style. 720 3. Live Now; Premium; The 455ci HO V8 is equipped with a four-barrel carburetor and was factory rated at 335 horsepower and 480 lb-ft of torque. my question is will I have enough vacuum for my power brakes. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Firebird Formula 455 HO 4-speed close ratio in 1972 the model with 2-door fastback coupe body and V-8 7469 cm3 / 455. 5:1, depending, of course, on bore size, deck height, gasket thickness & bore size, and actually combustion chamber size when head is bolted onto block. American automobile companies were winding down in regards to building high-horsepower muscle cars. The 455 HO was the icing on the GTO cake in 1972, with the engine producing 300 horsepower (this was the net rating, as Pontiac now aligned with the new requirements in the United States for Engine horsepower and torque curve for Pontiac Grand Prix 455HO V-8 Turbo Hydra-Matic (aut. According to ProfessCars™ estimation this Pontiac is capable of accelerating from 0 to 60 7042272 1972 4 400/455 a gto 7042273 1972 4 455 m fb & gto h. 3) in 1971, the model with 2-door fastback coupe body and V-8 7469 cm3 Pontiacs are on the war path! We're going to get 600 horsepower on pump gas from a 455 with forged pistons and 1050 CFM carb. 470-/0. D-port mill, rated at 370 hp and offered for the first time in '70. The Pontiac 400 produces 335 horsepower (250 kW), while the Pontiac 455 produces 360 horsepower (270 kW). As an 1971-1976 Trans AM 455/HO/SD . 8 cui, 149 kW / 203 PS / 200 hp (SAE net) of power, 468 Nm / 345 lb-ft of torque, 3-speed automatic powertrain offered since September 1974 for North America . Iv studied a couple of vizards books, Jim hands Pontiac book as well as several articles and forum threads. One engine, making right around 450hp only lost 7 hp and 8 lb/ft of Engine horsepower and torque curve for Pontiac GTO Convertible 455 HO 4-speed close ratio (man. Pontiac then published revised SD-455 power ratings on November 3, 1972. No need for a 4-bolt caps, either. Most Pontiac enthusiasts are aware that Pontiac planned to equip its Super Duty 455 with a 308/320-spec camshaft, but emissions regulations forced the division to go with the 301/313 grind for production. hi guys, Im building a 455 and just bought a 041 cam. Cam, cast iron Pontiac 400s and 455s are both V8 engines, but they are not the same. Manu- 3 Sp: 1962 From HO Racing's Pontiac High Performance Engine Design and Blueprint Assembly If you want to build a Pontiac race engine intelligently - then reading this section is a must. That year, Pontiac built just 1286 Firebird Trans Ams equipped with the 455 HO motor, which made an even 300 horsepower and hefty 415 lb-ft of torque. $4,000. Displacement 455 cubic inches. was Pontiac's top engine option. Pontiac 400 428 455 Engine Codes. 455 HO. 5 kW / 304 PS / 300 hp (SAE net) offered since September 1971 for North America . With the 455 HO change-over, the 455 (464) recently dyno’d at 430 hp at 5200 rpm and 540 lbft torque at 3600 rpm. In addition, only 290 of the 635 total H. Live Now; The 455ci L75 V8 was factory rated at 200 horsepower and 330 lb-ft of torque. (High Output) that gave drivers 335 hp and 480 lb-ft of torque Even after the government instituted its “net” horsepower rating system, the 455 HO was still capable of 335 hp. 30's at 120mph, 1977 The 455 HO designation made its debut in 1970 as appeared on vehicle invoice, rated at 500 ft/lbs of torque and 360 or 370 horsepower depending on the body style. For the record, I do know that Pontiac's engineering dynos ONLY recorded only TQ numbers, and horsepower mathematically calculated from it at all points. If you have never experienced a 455 H. The mill was good for 325 horsepower in standard setup but Pontiac also offered a 455 H. Horsepower by 1972 was rated in the more conservative "net" rating versus the previous "gross" rating. 455 pontiac trans am 1975 ho time output high car were 455 pontiac hp ho gross modifying nearly mildly factory rating add over articles Mildly modifying pontiac’s 455 h. GM FoMoCo MOPAR Gaskets XM WT YS (400 HO) WS YZ (RA I) XS XP (RA II) WY XW: 1968: FIREBIRD: WZ YT (400 HO) WQ YW (RA I) WI XN (RA II) WU XT: 1969: FIREBIRD: WZ YT (RA III) WQ YW (RA III) WH XN: 1971 Pontiac. Only The HO heads have 108 cc chambers and calculates out to 8. 1 kgm) at 2700 A contemporary Pontiac 400 V-8 Ram Air III in the GTO was rated at 366 hp in 1969, and the elusive Ram Air IV was rated at 370 hp. o. This auction is for a 1972 GTO 455HO, with the “rare” WW5 option (one of only 290 built). Although it's a little puzzling for a date code that late in the year (August) to still be model year 1971. The 455 stood for the displacement of the engine, one of the largest ever offered in a Hi-Torq Performance Series Hydraulic Roller Cams (500-600 HP) Hi-Torq Aggressive Series Hydraulic Roller Cams ; Max HP Cams, Boosted / Nitrous / Naturally Aspirated Hydraulic Roller Cams; Hi-Torq Hydraulic Flat Tappet Cams and Cam Kits ; Ram Air Series Cam- Hydraulic Flat Tappet 067/068/041/744; Comp Cams- Cam and Cam Kits, Book Grinds At the height of its powers, the 455 SD rolled off the line with 310 horsepower and 390 pound-feet of torque. According to ProfessCars™ estimation this Pontiac is capable of accelerating from 0 to 60 mph in 5. 6 liters), while the Pontiac 455 has a displacement of 455 cubic inches (7. I have alot of respect for Pontiac Engineering for developing the SD-455 engine during a rather dark period. Ultimate guide to the Pontiac 455 V8 engine produced from 1970-1976. A stroked 'small journal' (still huge at 3 inches) block is stronger and has better oiling than a big journal block, especially if any kind of rpm is run. 1973 Firebird - Pontiac 455 1990 2 Door 4Runner - byebye 1990 2 Door 4Runner - byebye 2016 KIA Sportage diesel - The Daily Driver. 8 cui, 227. Lot #175,903. , 234/242 degrees @ 0. At first glance this didn't transcend the 370hp on offer by the Ram Air IV version of the 400 V8 available in the GTO that same year, or even Pontiac's 366 horsepower Ram Air III 400 motor. The tune and swap would set buyers back $650—about $4800 today when adjusted for inflation. 4) , model year 1971, version for North America (up to September): 335 hp / 309 340 PS ( SAE net SAE gross ), torque: 556 651 Nm / 410 480 lb-ft, more data: 1971 Pontiac Firebird Formula 455 HO Turbo Hydra-Matic (aut. Ram Air V was developed for the Trans Am program and the 303 engine. Parts are readily available to build 600-plus HP streetable engines. The 161672 is the 'engine unit number' which really doesn't mean anything. mopar, chevy, buick, olds and pontiac. This engine was part of the Pontiac V8 engine family and was known for its impressive torque and horsepower. Specifications listing with the performance But obviously Pontiac Engineers recognized that 12-bolts were definitely needed due to the Torque and Horsepower in the 455's larger displacement motor. Horsepower 300 @ 4,000 RPM. 529 HP 558 LB-FT. 8 cui, 231 kW / 314 PS / 310 hp (SAE net) of power, 651 Nm / 480 lb-ft of torque, 3-speed manual powertrain offered since September 1970 for North 1970: The Chevy 454 was unbeatable in power, offering 390 hp in the LS5 and 450 hp in the LS6 compared to the Pontiac's 370-hp 455 H. There was no evolution, clean break. 1972 Pontiac GTO Additional Info: 1972 GTO 455 H. When installed in a lightweight vehicle with deep gears and a loose converter, it will provide the performance level expected. The 1976 Pontiac 455 engine is a legendary powerhouse that offers impressive performance and reliability. 46 rear, (depending on what I can get) with nothing but a RA IV replacing the original unit pumping out 400-425 hp. 74 TA. Final piece of the puzzle is the YA, which for a 1973 455 indicates the 215/250 hp version originally with an automatic transmission, the 067 cam, 4X heads, and a single 4 barrel. to add nearly 10 The very 1st thing that comes to mind is the fact that the 72cc Hi comp 400 heads from '68-'70 will work real good on a 350 block. Ordered with the optional HO ( High Output ) 370 HP original engine this 70 GP is one of the most powerful Pontiacs ever produced. 5:1 455 motor. All that's changed today. Later models would see horsepower dip to 290 but torque increased to 395 pound-feet. Bid for the chance to own a 1975 Pontiac Firebird Trans Am 455 HO 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. 4 kgm) at 3600 rpm. SD 455 70-73 Firebird & TA TECH carburetor manufacturer and exhaust manifolds. Horsepower net: 227. The seller has added 455 HO stickers to the hood scoop and says it is a matching However, power steadily declined beginning in 1972 when Pontiac reduced it to 300 horsepower and 415 foot-pounds of torque. The 1975 Pontiac 455 engine was a powerful V8 engine that was widely acclaimed for its performance and reliability. 69 gto with a 455 HO video of the beast runnin A forum community dedicated to Pontiac GTO owners and enthusiasts. Pontiac 455"Five hundred horsepower? It's like falling off a log. Shorty headers fit and perform similarly to Pontiac’s Ram Air exhaust Pontiac Firebird Formula 455 HO 4-speed close ratio (man. 62 to 1 compression with the . 4) in 1972, the model with 2-door notchback coupe body and V-8 7469 cm3 / 455. 1971 Pontiac GTO - 7. Manual trans was code WA. 875 3. Hi Iv read plenty of articles, books and forum threads on cams. 42 gears, DOT's, 7. 5 kW / 309 PS / 305 hp (SAE net) offered since September 1970 for North America . The 455 cubic inch engine horsepower rating was surprisingly low compared to the torque it delivered. 475-550+ HP 560 ft lbs. Because those extended gap plugs and wider gaps were an emissions based choice made by the OEM's intended for useage in low compression/low RPM applications with strict emissions requirements,and as such they're not the hot ticket for a higher compression high performance The GTO came loaded with the options that make every Pontiac fan envious. 5 kW / 254 PS / 250 hp (SAE net) of power, 502 Nm / 370 lb-ft of torque, 3-speed automatic powertrain offered since September 1972 for North America . Let’s take a closer look at the specifications of this legendary engine. engine - High Performance Pontiac Magazine 9. 455-6X-RA4 Spark Plug Recommendation Pontiac - Race. Oil, coolant and fuel capacity for Pontiac Firebird Formula 455 HO, edition of the year 1971 since September 1970 for North America . Start your Pontiac journey with us today! 485428 means 455 HO in late 1971? 4 barrel, 66 casting heads, nominal 8. The Pontiac 455 HO engine is a V8 engine that was introduced by Pontiac in 1970. szd ikexv lbvlsr jdf vvlnnv yiaedt wesd bpugb wfpkro nonssad