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OVERBORE head gasket!

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How big of a bore do you have?

On a 420a the stock head gasket will fit 40 over, if not more. Granted I don't know if its the same for the 4g64.
 
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thicker would be nice at least. Thats kinda ### I'm shooting for. I'm only going 10 over, but I wanna make sure nothing scrapes when I run it hard.
 
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