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I think the combustion chamber is smaller on the dohc, so you'd have somewhat higher compression ratio after the swap.

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Nope just a difference in the pistons themselves but compatible all the same. SOHC pistons are higher compression.

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Your new compression ratio will depend on the gasket you use. I suggest a cometic 60 thousands. Should be around 10.6:1. should be good on 89 octane.

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