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1990-2016 MCM 3.0L, 3.0LX, & 3.0L MPI 3.0L Industrial. All new Quicksilver cast iron cylinder head, hardened valve seats press fit into the cylinder head with stainless steel valves featuring seats treated with a cobalt-chromium alloy for extreme durability. This cylinder head features screw-in rocker studs. Smaller ports are updated to the latest design to deliver more power. No provision for in port fuel injector for non-MerCruiser applications.