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2.5 phase 2 heads on 2.5 phase 1 block


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you would have some crazy high compression, if i remember right the phase one pistons come past the deck of the block just barely, but more then the phase 2 does. so the CCs in the combustion chamber is smaller in the phase 2 heads.

 

it's doable, but still the question is why, the DOHC heads aren't bad.

 

not unless it's the thing of "I have all these parts laying around lets see if I can make an engine"

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It is an option. You should use the DOHC head gaskets to minimize any interference issues. I have a friend who is a subie mechanic and he has done it for one of his engines because he had the parts lying around and didn't want to buy another engine.

 

Good Luck

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