All new Quicksilver cast iron cylinder head, hardened valve seats press fit into the cylinder head using Manley Extreme Duty stainless steel valves for high temperature durability. This cylinder head features rectangular ports for MerCruiser High Performance applications using 2.25" diameter intake valves.
HP 500 & 500 EFI
540 Mag Crate Engine
Cylinder head gaskets sold separately
All new Quicksilver cast iron cylinder head, hardened valve seats press fit into the cylinder head using Manley Extreme Duty stainless steel valves for high temperature durability. This cylinder head features rectangular ports for MerCruiser High Performance applications using 2.25" diameter intake valves.
HP 500 & 500 EFI
540 Mag Crate Engine
Cylinder head gaskets sold separately