PRC CNC Porting Service - Cathedral Port Heads (Customer Supplied Castings)

Regular price $799.99 Save $-799.99
99 in stock

The price listed is for you sending your cathedral port cylinder heads (4.8/5.3, LS1, LS6, LS2, LQ4/9) to us for porting. Our stage 1 porting service will include the re-use of the stock vales.  Stage 2.5 will include 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

 

Click Here to SEE why we build better heads! All Precision Race Components (PRC) cylinder heads come fully CNC-ported and machined using state-of-the-art technology. 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

 

 Stage 1.0 LS6 Flow Chart
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

 

 Stage 2.5 LS6 Flow Chart
Lift Intake Flow
Exhaust Flow
 .200" 147 cfm
114  cfm
 .300"  207 cfm
 152 cfm
 .400"  255 cfm
 191 cfm
 .500"  292 cfm
 207 cfm
 .600"  316 cfm
 226 cfm

 

 Stage 1.0 LQ9 Flow Chart
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

 

 Stage 2.5 LQ9 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

   

*Typically a 1-2 week turn around time once heads arrive at our facility.

*Stage 1 porting NOT available for 4.8L and 5.3L castings due to the factory 1.94" intake valve size.  All 4.8L and 5.3L cylinder heads must select the stage 2.5 option that includes 2.02"/1.57" stainless steel valves!

 

Castings: 

  • 4.8/5.3 (706/862)
  • LS1 (241/853)
  • LQ4/LQ9 (317)
  • LS6/LS2 (243/799)