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Although there are specific Magnum gaskets, regular early-style gaskets work just fine. We used FelPro gaskets, which have a compressed thickness of .040 inch, giving a perfect minimum quench clearance with our 360's zero-deck pistons. With closed-chamber heads, it's important to consider the piston-to-head clearance, and .040 inch is as tight as we'd go with a street engine. Early 340s had a positive deck and required .055-.060-inch-thick gaskets for minimum clearance.