Quote:
Originally Posted by CGT
Currently going through this so I thought it would be worth mentioning. I have had trouble with two sets of Holley covers now, leaking with GM gaskets.
The Felpro gasket seems to fit the Holley's Ive had better and solved the issue. The GM gasket (12637683) seems to be to tight or deep for the groove in the Holley valve covers.
Your results may vary.
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Good info, I had the Fel-Pro gaskets on mine and I saw some leakage in the back after half a year.
Disclaimer: The car saw many days on track and I just found a bad valve seal, so that might have forced the leak.