Ad
related to: 455 pontiac engine horsepower
Search results
Results From The WOW.Com Content Network
After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400 cu in (6.6 L). Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am.
Engine options remained mostly unchanged, however, the L75 455 engine was dropped, but the LS5 455 HO remained as an option for the Formula and standard for the Trans Am. Pontiac advertised the 1972 455 HO as de-tuned to 300 hp, but the engine was unchanged from 1971.
The 455, a long-stroke engine also available in the full-size Pontiac line as well as the Grand Prix, was dubiously rated by Pontiac at 360 hp (270 kW), only moderately stronger than the base 350 hp (260 kW) 400 cu in (6.6 L) and less powerful than the 366 hp (273 kW) "Ram Air".
The 1973 Trans Am engine displaced 455 cubic inches in the base L75 and the Super Duty LS2 option. The base 455 produced 40 fewer horsepower than the round port Super Duty 455. Horsepower for the base L75 455 was rated at 250 at 4,000 rpm and 370 lb/ft at 2,800 rpm.
The Pontiac Bonneville is a model line of full-size or mid-size front-engine rear drive cars manufactured and marketed by Pontiac from 1957 until 2005, with a hiatus for model years 1982-1986. The Bonneville (marketed as the Parisienne in Canada until 1981), and its platform partner, the Grand Ville, are some of the largest Pontiacs ever built ...
Optional engines included a 455 cubic-inch V8 with two- or four-barrel carburetion and respective horsepower ratings of 285 and 325, respectively. All Pontiac engines for 1971 were designed to run on lower-octane regular leaded, low lead or unleaded gasoline thanks to a GM corporate edict, necessitating reductions in compression ratios.
Engines were also detuned to meet the 1975 emission regulations with the compression ratio dropping to a new low of 7.6 to 1 on some engines. Standard was the 170 hp (127 kW; 172 PS) 400 cu in (6.6 L) V8 with two-barrel carburetor, optional were a 185 hp (138 kW; 188 PS) 400, or a 200 hp (149 kW; 203 PS) 455 cu in (7.5 L) - both with four ...
The sole engine offering was a 455 cubic-inch Rocket V8, with four-barrel carburetor and dual exhausts, with the 250 horsepower (190 kW) L75 U code engine. Also available was the L77 V code 455 with 270 horsepower (200 kW) available only without air conditioning. Although Pontiac's SD 455 cubic-inch engine lasted one more year with 290 ...
Ad
related to: 455 pontiac engine horsepower