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Ultimate head gasket for forced induction S54 engines. These feature an organic gasket combined with a metal cooper ring/cut rung around each cylinder for an unbeatable seal. Combine this gasket with one of our ARP head bolt sets for a bulletproof gasket solution. Does not require any additional machining for the cut rings (unlike o-ringing). The latest version of this head gasket includes newer style cut rings that have a triple groove cutting surface for maximum sealing. 87.5MM bore, 0.048″ thick.