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Machining cylinder head for more compression?

z shredder

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I found this with google not sure if it's correct:


The E30 did in fact come on certain models of the L20A. They have a closed combustion chamber just like the E31, so they allow you to have higher compress just like the E31, and use small ports and valves. They are built on the same basic casting as an E31, so the ports can be hogged out just as far as the E31's, and they can also be machined to accomondate bigger valves. Z man of Washington

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