The Pontiac 400 cubic inch motor (made between 1967 and 1979) is still a great platform for a high-performance daily driver.
The HorsePower guys prove that by extracting a 400 from a junkyard, machining the block, and rebuilding it on a two-thousand dollar budget. The results of this recycled-power project are pretty impressive when it’s dyno time.
All GM engines are stamped with an engine ID code, consisting of assembly plant code, production date, and suffix code.
Inspect the casting numbers on the engine block. The GM 400 cubic inch engine has only three distinct numbers…
Casting # | CID | Main Bolts |
330817 | 400 | 2-Bolt Main Engine Block |
3951509 | 400 | 2-Bolt or 4-Bolt Main Engine Block |
3951511 | 400 | 4-Bolt Main Engine Block |
Browse All GM Engine Block Casting Numbers…
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