Leaky valve cover follow up.

RonsSwinger said

The original was cork, and I upgraded to the silicone……… The cork didn’t leak. I think I am too tight. I will find out in the next day or two.

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So, it wasn't an upgrade then huh? I tried a fancy schmancy silicone valve cover gasket on my slant 6 and went back to cork because the crappy "upgraded" silicone gasket leaked like Niagara Falls.