QCS CNC Ported GM 243/799 Heads

CNC ported GM 243/799 Castings

Competition 5 Angle Valve Job

2.0" Intake & 1.55" Exhaust Valves

227cc intake runner, 84cc exhaust

62cc chambers

Completely Assembled with our QCS Dual 660 Valve Springs w/ Titanium Retainers

Laser Engraved QCS logo

Sold in Pairs 

Lift       Intake Flow    Exhaust Flow
.200"       148 cfm           115 cfm
.300"       208 cfm           153 cfm
.400"       256 cfm           193 cfm
.500"       293 cfm           205 cfm
.600"       314 cfm           221 cfm
.650"       317 cfm           225 cfm