Sierra Cylinder Head Assembly 18-4491
Sierra Cylinder Head Assembly 18-4491 Replaces MerCruiser 938-827178
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.