Originally posted by totheredline
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As a public service, C/Rs:
US b34/b34 head 8:1 Good choice
EU b34/b34 head 10:1 Bad choice
US b34/b35 head 7.45:1 Best choice
EU b34/b35 head 9.11:1 Really bad idea
So, adding a b35 head to a b34 block would give you the lowest compression and best flow. Do not use a b35 intake on a b34 head or vise-versa. The ports are shaped differently. Also don't use a B35 head on a EU b34 because the piston crowns are shaped differently than the combustion chamber of the b35 head and will hit the head unless you use a thick head gasket. But using piano top pistons in a turbo build is silly anyway.
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