Intake & Exhaust valve
I am not sure, but with my experience with working on my dads mustang, I don't think it will make a difference, and if there is, not a noticable one. The only ways I can think of is the weight of the intake and exhaust valve. Maybe a lighter type will make a slight difference, but i don't think its worth it. If you really want to get some more HP from your engine, stroke it.
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Honda Civic Forum
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