PRC's stage 1 6.0L Cylinder Heads come standard with the following options:
NEW GM 317 Cores
2.00"/1.55" GM Valves
Your Choice of Spring Kit
Completely Assembled and Milled to your Specifications
65-72cc Chambers

All PRC cylinder heads are extensively researched and tested. The flow data below shows the superior performance of the PRC stage 1 6.0L cylinder heads!

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