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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.
1928–1954 Pontiac GMR (also modified for GMC trucks) 1930–1966 Opel inline-6 (as used in the Opel Kapitän) 1936–1962 Chevrolet Blue Flame inline-6 (also used in some GMC trucks) 1939–1962 GMC inline-6; 1948–1962 Holden Grey; 1962–2001 Chevrolet Turbo-Thrift; 1964–1965 Pontiac OHV (derived from the Chevrolet Turbo-Thrift) 1966 ...
This engine featured a conventional one piece cylinder head, and the distributor was moved to the side of the block. The number of main bearings was increased to four. Like the Pontiac Straight-8 engine it also featured full-pressure oiling and insert type precision main and rod bearings. These two latter features greatly increased longevity ...
A Silver streak 8 in a 1949 Pontiac Streamliner - note the large intake silencer leading to an oil-bath air cleaner on the left side of the engine. The Pontiac straight-8 engine is an inline eight-cylinder automobile engine produced by Pontiac from 1933 to 1954. Introduced in the fall of 1932 for the 1933 models, it was Pontiac's most powerful ...
The Trans Am now had three different engine options, the standard Pontiac L78 400, the optional extra-cost Pontiac W72 400, and the Oldsmobile-sourced L80 403. The 1977 models also saw the cubic inch numbers on the shaker switched in favor of the metric displacement.
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The 400 was made in 4-bolt main journal from 1970 to 1972 and in 2-bolt main journal from 1973 to 1979. The 400 can have either 2 or 3 frost-plugs per side though all 400 blocks have the provisions for a 3rd frost-plug on each side. The 400 was rated at 245–265 hp (183–198 kW) gross (150–180 hp (112–134 kW) SAE net) through its life ...