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Did you originally install those Felpro gaskets? We have been through this discussion on 60V6 with a GM tech that says the same thing. We both concluded that installation error will kill any lower intake gasket for these motors and since he wasn't the one to do the work, he could not verify it was not from over tightening them. Also, were the bolts coated with loctite? That is a known issue, for them to back out from vibration and cause leaks. This may have been the cause for some of the plastic gasket failures as well.
So the important part is correct installation with the loctite on the bolts.
What does lifter preload have to do with 1/4 mile times?
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