The price listed is for you sending your cathedral port LS6 cylinder heads to us for porting. Stage 2.5 includes aftermarket 2.02/1.57 stainless steel valves. We also offer valve spring upgrades.

PRC CNC Porting/Machining Service Includes:

Disassembly
Deep Cleaning
CNC Porting
CNC Valve Job
CNC Engraving of PRC Logos
CNC Milling to Your Specs
Reassembly
Pressure Testing

With all PRC cylinder heads, quality and performance are our two highest priorities! In addition to this, you will not find a better performing cylinder head porting service at this price. Call one of our sales consultants today if you have any questions or if you would like to discuss your specific application.

Stage 2.5 LS6 Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	114 cfm
.300"	209 cfm	152 cfm
.400"	258 cfm	191 cfm
.500"	294 cfm	207 cfm
.600"	316 cfm	226 cfm

If you're purchasing valve springs separately such as with one of our cam kits, reach out to our sales team and we will install those for you.

*Please Remove all Cylinder Head accessories (Spark plugs, Coolant Plugs and Steam port blocks) before Shipping. Texas Speed and Performance is not responsible for any lost Parts.