Precision Race Components LS6 Stage 1 CNC ported cylinder heads.  Fully CNC ported LS6-based cylinder heads!

• NEW GM 243 or 799 Cores
• 2.00"/1.55" Standard GM Valves
• Your Choice Of Spring Kit
• Completely Assembled & Setup To Your Specs!!

Flow Data:

3.910" Flow Plate - No Exhaust Pipe

Lift	Intake Flow		Exhaust Flow
.200"	147 cfm		114 cfm
.300"	207 cfm		148 cfm
.400"	255 cfm		187 cfm
.500"	292 cfm		202 cfm
.600"	313 cfm		220 cfm

Valve Lift