LS3 heads are hard to beat for the money. Like already mentioned they are picky with cam selection but that doesnt make them a bad head. C6 6 speed vette, cam, cai, headers, 495rwhp is pretty good IMO. My G8 just made almost 400 through auto with a ls9 cam (not best NA cam at all) and stock ls3 top end. For a stock head thats fairly cheap they arent bad at all. You cant compare a stock head to a trick flow or any after market casting, I hope the after market heads blows away a stock head, lol.
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1999 Z28 Camaro|Cut up
2003 CC Duramax Dually|19.5 w/245/70/19.5|5in exhaust
2009 G8 GT 408hp/402tq sae|Rotofab CAI|LS9 Cam|Headers|GXP Mufflers|Custom System
2009 Tahoe stock
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