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Vortec heads use a clever reusable intake gasket that virtually guarantees leak-free sealing. Silicone rubber is bonded to a hard, non-compressible plastic skeleton. The correct GM shouldered intake bolts allow a precise amount of gasket compression before bottoming out, ensuring a correct installation every time. As directed, we didn’t use any sealant on these gaskets, and we didn’t find any leaks. View Related Article
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