L92 heads
08-23-2012, 11:41 PM
#21
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If I had big money I would have definitely done a bigger cam, fast 102, and tfs heads instead of the ls3 stuff. That said, I have yet to see another auto car at the same track at the same time with those mods run over 1-2 mph faster on the big end than my ls3 junk. Great cost effective upgrade for sure.
08-23-2012, 11:44 PM
#22
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You can make that without the L92 heads on the stock cam. I don't think L92 heads are really going to do anything for the OP unless you have a big cam to rev high and use all of that port volume. Even then, I'd rather have a ported 243 head instead.
Stock LS2 heads and cam + bolt ons
Stock LS2 heads and cam + bolt ons
08-24-2012, 01:35 AM
#23
08-24-2012, 01:18 PM
#24
First of the Cathedral port FAST intake is the undisputed king when it comes to factory style manifolds. While gains with the rectangle port FAST models may be up for debate the cathedral port model is not.
Second there are 6.0 cars toppling 500RWHP with AI ported 243's.
Like many here have said, the LS3 topend is good for a budget build, but in all out trim with a FAST intake the cathedral setup is going to win out, all of this asusming you are on a 4" bore like the OP. Go to a 6.2L and IMO things change.
Just my .02
08-24-2012, 03:15 PM
#25
Despite the extra 14 cubic inches, the LS3 doesn't start making more power until 3.5K rpm.
I think 243 heads on an LS3 block and cam with a FAST102 intake would give much better low end response than LS3 heads with an LS3 FAST102, without sacrifing much in the way of top end.
I would spend the money not on an LS3 topend swap, but on an LS2 FAST102. Obviously, larger displacement motors the LS3 heads will shine, but I would still rather have a set of AFR or TFS than comprable square port heads.
Last edited by 409CISecondGen; 08-24-2012 at 03:21 PM.
08-24-2012, 05:02 PM
#26
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I'm keeping the stock block so I'm just going .005 over I dont have the cash for new ls3. I would like to keep a thick cylinder wall for when I push nitrous.
