Sierra Marine Parts Catalog

650 INTERNAL ENGINE COMPONENTS — Cylinder Heads, Timing Covers/Flywheels 18-4516 RING GEAR-FLYWHEEL 14" GM flywheel w/ 168 teeth 18-4517 RING GEAR-FLYWHEEL 12" GM flywheel w/ 153 teeth 18-4518 FLYWHEEL 14" 4.3L V-6, 1 piece main 1987 and up. Bottom mount starter (Block mounted) applications 18-4519 FLYWHEEL 14" 5.0/5.7L, 1 piece main 1987 and UP. Bottom mount starter (Block mounted) applications. 18-4522 FLYWHEEL 14" 454, Gen IV w/ 2 piece rear main. Bottom mount starter (Block mounted) applications. 18-4521 FLYWHEEL 14" small-block GM, 2 piece main, pre 1987. Bottom mount starter (Block mounted) applications. 18-4501 CYLINDER HEAD Fits: 5.0L Vortec 18-56870 TIMING COVER Replaces: Mercury 59341A1 Fits: GM 3.0L w/ tin cover 18-4497 TIMING COVER For: Small block GM-(1986-1995) 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. 18-4523 FLYWHEEL 14" 454, Gen V & VI w/ 1 piece rear main. Bottom mount starter (Block mounted) applications. 18-4503 CYLINDER HEAD (HIGH PERFORMANCE) • Up to 60 HP increase over OE cylinder heads • 5 angle valve seat cut • Double drilled intake mounting • For either standard 12 bolt GM intake or late-model 8 bolt Vortec intake • Accepts both perimeter or center bolt valve covers • Fits 5.7 & 6.2L small block GM V-8 applications • OE look • Corrosion resistance heavy-duty cast iron castings suitable for saltwater usage • Intake Runner: 185cc • Exhaust Runner: 62cc • Combustion Chambers: 72cc • Intake Stainless Steel Valves: 2.02 • Exhaust Stainless Steel Valves: 1.60 • Cast Iron Cylinder Heads: Sold in pairs only