Sierra-Cylinder Head Assembly 4.3L Vortec #18-4491

Description

Sierra 18-4491 Cylinder Heads

All cylinder heads are new castings and complete assemblies with new- stainless steel valves, hardened steel exhaust seats, valve springs, valve locks, and retainers. All GM cylinder heads utilize high performance screw-in rocker arm studs in place of factory press in rocker arm studs.

Replaces: MerCruiser 938-827178 1, 938-824147
Replaces 4.3L Vortec V-6 (1996-Up) with screw in rocker arm studs (non-adjustable valve train), 8 intake manifold mounting bolts, center mount valve cover.

NOTE: not for use with engines using factory roller rocker arms.

OEM Interchange:

MERCURY MARINE: 938-827178 1

Cylinder Head: Chevrolet

Sierra Cylinder Head Assembly, 4.3L Vortec #18-4491

Normalized SKU: 184491

UPC Code: 808282228804