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1968 and 1969 400s shared the Olds big-block standard 4.25 in (107.95 mm) stroke with the 455 but used a undersquare 3.87 in (98.30 mm) bore to comply with GM's maximum 400 cu. in. displacement restrictions in the A-body cars while also reducing tooling costs. Displacement is similar to the earlier engine, at 399.9 cu in (6,554 cc).
For this purpose, Paxton superchargers were fitted as the rare (211 produced) F-option for the 1957 Ford Thunderbird. A short run of Shelby Mustangs were fitted with Paxton superchargers, and Ford dealers offered Paxton superchargers as a dealer-fitted Ford Mustang option from 1965 to 1972. Paxton still provides supercharger kits for older ...
Being nearly identical, it too has the distinctive odd-sided hexagonal shape. These engines can be fitted in rear wheel drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model engine swaps. All Cadillac Northstar V8s; Oldsmobile Aurora L47 V8; GM 3.5L LX5 "Short Star" V6
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".
For example, while the Cadillac Seville initially used a variant of the 350 cu in (5.7 L) Oldsmobile V8, Cadillac also began work on its own proprietary engines. [ 6 ] [ 7 ] In 1977, Cadillac introduced a new 425 cu in (7.0 L) V8, based on the architecture of the 472, but with a smaller, 4.082 in (103.7 mm) bore and the same 4.06 in (103.1 mm ...
At the time of the 1973 oil crisis the only engines Pontiac built were 350 cu in (5.7 L), 400 cu in (6.6 L), and 455 cu in (7.5 L) versions of their V8 engine. Recognizing that future products would need to be smaller and more fuel-efficient, Pontiac engineers were tasked with developing a new engine that would be suitable for these future ...