WTB....LS3 and/or 243/799 heads and LS3 intake manifold....................<<<<<<<<<<
09-02-2012, 07:22 PM
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Member Since: Jul 2012
Location: Louisville Kentucky
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All you need to know to go LS3 on a LS2 block
A ls3(or L92) heads generally are 68cc-70cc plus and Ls2 heads are 64cc. Ls3 heads will need to be milled to maintain proper compression .020-.030(it cost me $60 dollars).You can use a LS3 intake,but you will need a LS3 map sensor as they are a bolt on not clip on like a LS2.The better choice would be a L76 intake(uses LS2 clip on map sensor) which can be had new on a auction site(unnamed on purpose)for $200(that is what I use).The LS3 head has rectangular ports and Ls2 is cathedral port on the intake and heads(exhaust port is not a factor).You will also need a LS3/LS7(Z06) injector as the intake excepts a different length.Also the exhaust rockers are off-sett design so you would need 8 LS3/L92 rockers .Also you will need a Ls3 head gasket that is 4.080 or larger.I used GM performance parts cnc LS3/l92 88958698 heads(at $599 complete per) as they outflow "ALL" cathedral port heads on the market at 360cfm intake and 260 exhaust.With a combo like this you should see over 500+hp and 480+ftlbs of torque at the flywheel with headers,CAI and a tune with a stock cam and stock idle.This not a scenario this is the SLPZL500 combo tweaked which is DYNO verified at 440+ RWHP and 430RWTQ on a DYNO. 
