PRC Stage 2.5 LS6 CNC Ported Heads




All Precision Race Components (PRC) cylinder heads come fully CNC-ported and machined using state-of-the-art technology.

PRC’s stage 2.5 LS6 Cylinder Heads come standard with the following options:

  • SEASONED GM 243 or 799 Cores
  • 2.02″/1.575″ Stainless Steel Valves
  • Your Choice of Spring Kit
  • Completely Assembled and Milled to your Specifications
  • 58-64cc Chambers

All PRC cylinder heads are extensively researched and tested. The flow data below shows the superior performance of the PRC stage 2.5 LS6 cylinder heads!


Flow Data: 3.910″ Flow Plate – No Exhaust Pipe

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

You also have the option to upgrade to the PAC .660″ Lift Dual Valve Spring Kit. This spring kit is the top of the line and offers almost double the life of other valve spring kits on the market! The following items are included in the dual spring kit:

  • PAC .660″Lift Capable Dual Valve Springs
  • Precision-Machined Titanium Retainers
  • Hardened Machined Spring Seats
  • New Viton Valve Seals


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

Additional information

Spring Kit

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

Combustion Chamber Volume

58cc, 59cc, 60cc, 61cc, 62cc, 63cc, 64cc


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