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Probably no gain unless you unshroud the valve by machining the combustion chamber.

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if that is shrouded, you can expect very little then bore size comes into play.
imo...

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Anytime I've tried unshrouding the intake valve (straight wall side) on an
OEM head, it hurt flow. I haven't tried it on the RPM though.

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That is interesting,
Have only seen the opposite.

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