LS9 CNC-Ported Head Assembly

  • Special A356T6 aluminum Roto-cast head casting for greater strength. The mold is rotated during production to create a more solid casting that virtually eliminates porosity
  • Reinforced webbing and thicker deck (for minimal distortion) makes it an excellent choice for supercharged and turbocharged engine combinations
  • CNC-ported for approximately 10 percent greater airflow (intake side) than the regular-production cylinder head (similar to LS3 CNC-ported head P/N 88958758)
  • As-cast 66.5cc combustion chamber volume
  • Fully assembled with production LS9 2.165″ (55mm) titanium intake valves and sodium-filled 1.590″ (40mm) exhaust valves; and beehive-type valve springs
  • Valve springs rated for .570″ max lift
  • Can be used on LS engines with at least a 4.000″ bore using standard 11mm head bolts in place of the LS9’s 12mm head bolts

Head P/N 19328743 assembled with the following:

  • 12605524 Titanium Intake Valve (2.165″)
  • 12596508 Valve Spring Caps
  • 12605525 Sodium Filled Exhaust Valve (1.590″)
  • 10166345 Valve Stem Keys
  • 12625033 LS9 Beehive Valve Spring
  • 12482063 Valve Seal-Intake (Integral Seal & Spring Seat)
  • 12482062 Valve Seal-Exhaust (Integral Seal & Spring Seat)
  • 12596509 Rocker Arm Wear Pads (Intake valve only)