Compression ratio vs Porting

thesiren74 said

put some 360 heads on a 318 that's whats its like lame! until about 3500

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Yes, because installing 340/360 heads on a 318 will lower compression at least 1.2.

If you want to put 340/360 heads on a 318, use 10.5 pistons and you will end up with 9.2 compression. -> I done it. Ran great on standard pump gas.