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where you say dont take over .030" is that using a standered gasket or copper? just thinking that standered gasket is about .053" and im going to use copper thats .012". guessing there will be gains in compression by using thin gasket. anyone elaborate on this for me?

Hi guys New to the forum, just looking for some specs on exhaust and how much to shave off head to raise compression and i know they around 5:1 ish standered , how much is too much?! Down here in New Zealand some mates and i have been building bikes with agricultural motors , im running a 5...