Sierra Marine Parts Catalog

902 OIL FILTERS CYLINDER HEAD ASSEMBLIES 18-4491 CYLINDER HEAD ASSEMBLY 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. 18-4489 CYLINDER HEAD ASSEMBLY Fits: 2.5L/3.0L GM (1968-95) 18-4486 CYLINDER HEAD ASSEMBLY Fits: 5.7L V-8 GM Vortec (1996-Up) with press in rocker arm studs with 8 intake manifold mounting bolts, composite valve cover 18-4485 CYLINDER HEAD ASSEMBLY Fits: 5.7L V-8 GM (1987-95) with press in rocker arm studs with 12 intake manifold mounting bolts- (4 inside intake manifold bolts at 23 degrees), center mount valve covers 18-4501 CYLINDER HEAD Fits: 5.0L Vortec I/O — OMC STERNDRIVE/COBRA - Internal Engine System 18-4501HP CYLINDER HEAD Fits: Vortec GM small block 5.0L Completely assembled with revised runner and combustion chambers. Add 30hp to stock motor with no additional modifications. Part # Fits: O.E.M # 18-7824-2 GM Engines (Short Filter) 173232, 502902 18-7875 Ford Engines (Long Filter) 173231, 502900 18-7876-1 GM Engines (Long Filter) 173233, 502901 18-7878-1 M-100, M200 (Short Filter) 502904 18-7879-1 GM V-6 Engines 173834, 502903 SEE PAGES 182-184 & 1147-1170 FOR ADDITIONAL INFORMATION 18-4486HP CYLINDER HEAD ASSEMBLY Fits: Vortec GM small block 5.7L high performance Completely assembled with revised runner and combustion chambers. Add 30hp to stock motor with no additional modifications.