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What are the main differences between a Chevy 400 & a Pontiac 400? Are the camshafts the same?
 

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To be blunt, probably everything except bolts and maybe the carb.

To make matters worse, there's a 400 small block chevy and GM called the 396/402 big block a 400 in some literature. And there were Pontiac 400s, but in the '70s they installed Oldsmobile 403s in Pontiac cars.
 

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I think what's the same is a shorter list.

Distributor cap comes to mind.
 
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