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1971 350/270 I have aluminum valve covers and used the rubber type gasket. The sales clerk at Checker Auto told me to put them on dry because using any type of sealer will cause them to shrink. I put them on dry and torqued them to specs with my Snap-On inch lb. Torqmeter wrench. No leaks. I did retorque them afterr warm up and cool down.
replace the gaskets and make sure all surfaces are clean and free of oil. If there is oil on the head or gasket it will leech the oil past the gasket and start leaking again.
I had problems with the gaskets slipping off of the head rails. I opted for the cork gaskets that include steel reenforecment sandwiched between two cork gaskets; no more slippage and they retain their shape. I've removed them several times and still no leaks.
one other possibility...I changed gaskets on mine several time without success...finally figured out that someone had installed some cheap valve covers that were slightly warped...new bowties and gaskets solved it...
one other possibility...I changed gaskets on mine several time without success...finally figured out that someone had installed some cheap valve covers that were slightly warped...new bowties and gaskets solved it...
I know a lot of people don't like them, but I use black rubber valve cover gaskets. I have aluminum heads and cast aluminum valve covers. I haven't had a leak yet.
replace the gaskets and make sure all surfaces are clean and free of oil. If there is oil on the head or gasket it will leech the oil past the gasket and start leaking again.