Page 686 - 2021 Sierra Catalog

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.
18-4503
• 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
CYLINDER HEAD (HIGH PERFORMANCE)
18-4735
INTAKE VALVE (2.02”)
Fits: GM V-6 & V-8 engines
18-4497
TIMING COVER
For: Small block GM-(1986-1995)
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.
18-4521
FLYWHEEL
14" small-block GM, 2 piece main, pre 1987. Bottom mount starter (Block mounted) applications.
18-4522
FLYWHEEL
14" 454, Gen IV w/ 2 piece rear main. Bottom mount starter (Block mounted) applications.
18-4523
FLYWHEEL
14" 454, Gen V & VI w/ 1 piece rear main. Bottom mount starter (Block mounted) applications.
668
INTERNAL ENGINE COMPONENTS — Cylinder Heads, Timing Covers/Flywheels, Intake Valve