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The Oldsmobile V8, also referred to as the Rocket, is a series of engines that was produced by Oldsmobile from 1949 until 1990. The Rocket, along with the 1949 Cadillac V8, were the first post-war OHV crossflow cylinder head V8 engines produced by General Motors .
The standard Hurst/Olds engine was the L75 455 cubic-inch Rocket V8 rated at 250 net horsepower (U in VIN). Optional at extra cost was the W-30 option with the L77 455, a blueprinted engine rated at 300 net horsepower (X in VIN). Both engines were mated to a Turbo Hydra-matic 400 transmission with console-mounted Hurst Dual-Gate shifter.
A limited-production model was the Hurst/Olds, a special 4-4-2 marketed by Oldsmobile and Hurst Performance. The H/O combined the 4-4-2 suspension package with a 455 cu in (7.5 L) Rocket V8, not ordinarily offered in Cutlasses because of a GM policy limiting intermediates to engines of 400 cu in (6.6 L) or less.
1970 was the pinnacle of performance from Oldsmobile. [15] [16] In order to keep up in the horsepower arms-race, General Motors dropped the cap on engine size in 1970, and Oldsmobile responded by making the Olds 455 V8 the standard 4-4-2 engine.
The '74 Stage 1 455 was only available with the Turbo 400 automatic and detuned to 245 hp (183 kW). This engine was also offered on other Buicks in 1974 including the Riviera, LeSabre and Electra. 1973-1975 Oldsmobile Cutlass Hurst/Olds W-30 — These were built using 455 cid V8 engines in the W-30 trim.
This was so named because it began with Chevrolet's V8 engines. Chevrolet big-block V8s; Chevrolet small-block V8s; GM Vortec 4300 90° V6; GM Iron Duke RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations) Jeep with GM Iron Duke inline 4 2.5L/151 in 3 (1980-1983).
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The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455".