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For complete engines, the weight of the average (stock) 400 Pontiac at about 650 lbs. is roughly between the average (stock) Chevy small block at about 575 lbs. and the average (stock) Chevy big block at about 680-685 lbs..

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Liberty Cosworth

Lvl 2
2y ago
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13y ago

exact weight? not sure, but the 400's a small block, over-bored-

454's a big block -

so, quite a bit different...

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Liberty Cosworth

Lvl 1
2y ago
The Pontiac 400 is not a "small block". Neither is it a "big block". With the exception of the short deck engines (late 265, 301 and earlier 303), Pontiac engines are basically the same size externally from the early 287 through the 455.

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