I promised everyone I would post additional pics & specs for both the PRC Stage 1.5 & 2.5 cylinder heads.

First The Chambers:
62cc Chambers CNC'd to 3.900" Bore

Valve Options:
2.02" or 2.04" Intake Valves
1.575 Manley Exhaust Valves (2.5 heads) or 1.55" Truck Exhaust Valves For (1.5 Heads)

This Pic Gives You A Look At Both The 1.5 & 2.5 Chambers With Valves:


Intake Port:
Runner Size 218cc


Exhaust Port:
Runner Size 80cc


Spring Options:
Standard Gold Spring Kit @ 1.800" 135# & 380#
or
Platinum Spring Kit @ 1.7850" 145# & 395#
(Platinum Spring Shown Here-->


We basically went in with the new retainer & gave us a little more pressure so guys can run bigger camshafts, more boost, or more aggressive lobes without risking valve float.

The castings are brand new GM heads that we receive fully assembled & tear down for cnc porting



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CNC Machine Specs:
2001 Haas HS1-5AXT

Complete 5 Axis Machining!
(checkout the Malibu in the background of the next to last pic

 

sweet

 

i got those. they are nice.