The price listed is for you sending your cathedral port cylinder heads to us for porting. Our 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 5.3L Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	111 cfm
.300"	207 cfm	145 cfm
.400"	254 cfm	185 cfm
.500"	291 cfm	204 cfm
.600"	308 cfm	223 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.