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Drilling holes, easier on head gaskets, run cooler, low cost
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03-17-2011, 10:39 PM
Tom McQueen
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Join Date: Dec 1999
Location: Mesa, AZ USA
Posts: 1,841
Yep. When you order head gaskets from Cometic, just tell them you want the '421' mod and the hole will be in the gasket.
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