Sierra 18-4485 High Performance Cylinder Head


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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

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