Mercury Quicksilver - Inline 4-Cylinder 2.5/3.0L Head Assembly - Fits MCM 2.5L/3.0L & GM 2.5L/3.0L, - 938-8M0115134All 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. Early design large intake ports require the use of gasket 27"96429. Fits: 1963"1989 MCM 2. 5L & GM 2. 5L 1968"1989 MCM 3. 0L & GM 3. 0L 2. 5L GM automotive & Postal engine
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