Mercury-Mercruiser 938-8M0115138 CYL HEAD-COMPLETE

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 fits 357 engines featuring upgraded ports for higher airflow. These are for engines with an 8‑bolt intake manifold pattern. This cylinder head features screw‑in rocker studs.

350 Bravo Quicksilver Crate Engines ‑ Carb & MPI
350 MIE Quicksilver Crate Engine
357 Bravo Plus Series engine
350 MPI Tow Sport Plus Series engine
357‑CT Circle Track engine

New cast iron cylinder head assemblies built for maximum durability in extreme applications. Features hardened seats on the intake and exhaust ports. Exclusive to Quicksilver are Black‑X Composite valves that are stainless steel valves with
seats treated with a cobalt‑chromium alloy and black plasma nitriding. This composition provides extreme durability when using gasoline and compatibility with alcohol and alternative fuels.