400 pontiac

Im buying a 68 firebird. It was originaly a 350 but now has a 400 in it. Whats the easiest way to tell if it is actually a 400 and how do I tell if its a genuine pontiac engine and not a chev. Thanks Wayne.

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Easy to tell a Pontiac engine from chevy. The pontiac engine (350&400) will have an air gap under the intake manifold. It's a little harder to tell if it's 400 or 350. I don't know about '68 but in 1970 only 350s were 2bbls. Next engine up was a 400 4bbl. Of course the '70 I owned with a 350 got a manifold change from a 400. Picked up about 20 HP and 2 miles per gallon highway going to the Q-jet from that POS 2bbl rochester. So you could find a 350 with a 4bbl.... AW.
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Andy Warren wrote:

Something like YF. Get that and then look it up. That's the only way to tell since they are the same basic block.
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writes

Mine has "400" cast into the block lefthand side just in front of the engine mount.
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David Toft

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