LQ4 with GM Performance LS3 heads
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Staging Lane
Joined: May 2010
Posts: 52
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LQ4 with GM Performance LS3 heads I'm looking at putting a set of the GM Performance LS3 CNC ported heads on my '04 6.0l. They are pretty cheap right now through Summit. I know that I will need a new intake, and my Harland Sharp roller rockers won't work (well the intake rockers anyway...) and probably my new Trick flow pushrods too...Am I opening up a big can of worms..? Is it worth the time/money? It has a thumper cam in it now that I probably will upgrade to something better suited to the heads. I'm just not sure what to do....
TECH Veteran
Joined: Sep 2014
Posts: 4,893
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From: Mississippi
I'm looking at putting a set of the GM Performance LS3 CNC ported heads on my '04 6.0l. They are pretty cheap right now through Summit. I know that I will need a new intake, and my Harland Sharp roller rockers won't work (well the intake rockers anyway...) and probably my new Trick flow pushrods too...Am I opening up a big can of worms..? Is it worth the time/money? It has a thumper cam in it now that I probably will upgrade to something better suited to the heads. I'm just not sure what to do....
I'm not a big fan of the LS3 heads on an LQ4. The compression is too low and the ports are too large. CNC ported LS3 heads are even worse. If you have an LQ4 with the 317 castings, I would stay with the cathedral port heads and find something like a 243/799 or 706/862 casting with smaller chambers.
