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

$750.00$1,299.99

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SKU: 199-CathedralPorting Category:

Description

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!

Additional information

Select Stage

Stage 1 (Reuse Stock Valves), Stage 2.5 (2.02"/1.57"Stainless Steel Valves(Add $200)

Head Castings

4.8/5.3(706/862), LS6/LS2(706/862), LQ4/LQ9(317)

Valve Springs

No Valve Spring Kit Installed, PAC 1219 .625" Lift Single Beehive Springs, TSP .660" Dual Valve Spring Kit w/PAC Valve Springs & Titanium Retainers, TSP .700" Dual Valve Spring Kit w/PAC Valve Springs & Titanium Retainers

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