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These blocks were denoted with casting numbers starting with 500, such as the "500557" blocks found in 1975-78 Firebirds. Pontiac did re-introduce the older, more durable block but the 400 no longer could meet the tightening emissions requirements, and block casting ceased in 1977.
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
There was also a "Service Replacement" block made as a modified GEN-3 design. This is a 401 casting (same casting number) without the displacement cast into the side and with a 360 bore and thicker deck. In theory, this single block could be built as any 343-401 GEN-2 or GEN-3 engine.
A 400 cu in (6.6 L) small-block V8 in a 1975 Avanti II. The 400.92 cu in (6,570 cc) 400 is the only engine in this family; it was introduced in 1970 and produced for ten years. It has a 4.125-inch (104.8 mm) bore and a 3.750-inch (95.25 mm) stroke.
1940–1967 Hydramatic — 4-speed Pontiac/Oldsmobile/Cadillac (totally different design than the later Turbo-Hydramatics) 1947–1952 Dynaflow — Buick's "2-speed CVT" 1950–1973 Powerglide — 2-speed Chevrolet (also used by Pontiac, Holden, Vauxhall and Opel). 1953-1955 Twin Turbine Dynaflow: the 1st redesign w/ 2 turbines & single stator.
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The 150.8 cu in (2.47 L) is commonly referred to as the "Iron Duke" and is a Pontiac design. It was purchased by AMC from 1979 through 1983 as the base option in the RWD Spirit and Concord, the 4WD Eagle models, economy versions of Jeep CJs, and in postal Jeeps. This early version used a Chevrolet small block V8 bell housing bolt pattern.
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