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GM - 19328743- $1749
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 P
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