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I have a '64 L-76 327 in my Vette. When I mock up the oil pan gasket with the thin front seal I can slip a .020 feeler gage between the seal and the pan easily with just the weight of the pan (not bolted down). My concern is I won't be compressing the seal very much when I bolt down the pan. I believe this application calls for the thin seal. I am using a NOS L76 Pan with an aftermarket chrome timing cover. Could the timing cover be causing the problem? Should I just use a thick seal?
 

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Those aftermarket chrome covers usually requires the thick seal.
Best of Tech archive has a thread on pan gaskets.
 

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If you can only put .020 between the gasket and pan , not bolted in. If you torque it down I think you"ll squesse down .020.But bolt it down and see, without starting it.
 
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