Hey Guys. I have a 11:1 compression 355. right now it has 64cc double hump heads on it, but i am gonna upgrade to dart iron eagle heads. 215cc intake runners. i was wondering what my compression ratio would jump to if i use the 49cc head over the 64cc head? thanks.
If you have 11:1 with a 64cc head, you will have about 13.7:1 with a 49cc head.
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