Sierra 18-4485 High Performance Cylinder Head
Sierra 18-4485 High Performance Cylinder Head, Sierra 18-4485 High Performance Cylinder Head All GM cylinder heads utilize high performance screw-in rocker arm studs; Cylinder heads are new castings; Complete assemblies with new stainless steel valves; Hardened steel exhaust seats, valve springs, valve locks and retainers; Fits: Vortec GM small block 5.7L high performance; CH350GA: 5.7L Hybrid Pre-Vortec 217 style casting; 65cc combustion chamber, 176cc intake runner; 1.94 intake valve, 1.50 exhaust valve; TBI/Vortec style bolt pattern/Center bolt valve cover; Note: Replace in pairs