If they're Patriots they'll have a serial number stamped on the milled flat end of the head. Newer patriot heads have patriot milled on the flat. Not saying Gunnar didn't port the stock heads on their machines. Many companies CNC port heads so they could be from any shop.
Last edited by RedHeartbeat; 10-14-2010 at 10:22 PM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Looked this morning only markings i have found was the stamped "P" in the center Intake runner after they machined them.
Last edited by Bigschwerm; 10-15-2010 at 08:26 AM.
99 4x4 5.3 NELSON TUNED / 02 Ls1 CAM / 02 Ls1 "241 Heads" Port/Polish milled .045" / 03 INJECTORS / AIR RAID JR. INTAKE / PORTED THROTTLE BODY / TR55's / EGR DELETE / E FAN's / CAT DELETE / EXHAUST DUMPED
Headers, Transgo HD2, 3200 stall, 4.56 gears coming soon.....
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