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Funny thing, my car also blew on cylinder 2. I actually had a cracked piston but rings were fine and I ran also 16 psi. Anyways, in my case, I think there must have been some defect on the bottom, so I rebuilt with forged everything. Sometimes these things happen and a 2871R pushed considerably more air into the cylinder... I say there just isn't much you can do. I tuned my own car and ALWAYS kept AFRs under check with innovative wideband with data logging... Not much you can do sometimes, doesn't mean the tune is bad....
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 Turn and Burn! 
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