Cam for carbed ls2 with ls3 heads
12-26-2013, 11:42 AM
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Cam for carbed ls2 with ls3 heads Hey guys I'm trying to get a feeler for what kind I cam specs I need to be running for my road race build. I have talked to a engine builder around town and he said to run a cam around 235 at .50 int and 244 at .50 exh and run the centerline at 100 with 600 lift. From what I've been reading that's a little off.
Build will consist of stock crank and rods. Racetec 4.030 pistons
Ls2 block
Ls3 heads in stock form
.051 head gaskets probably
Stock rockers with trunion upgrade
Gmpp single plane
Holley 750
Build will consist of stock crank and rods. Racetec 4.030 pistons
Ls2 block
Ls3 heads in stock form
.051 head gaskets probably
Stock rockers with trunion upgrade
Gmpp single plane
Holley 750
12-26-2013, 06:22 PM
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Im running a 234/250 .621/.629 112+4 on a stock bore/stroke lq9. Made solid torque from 3300 on to 5600 and hp peaked at 6800. Stock ls3 heads and a victor jr intake. It isnt lazy down low like people say but really pulls hard from 5k up. I had to flycut for the cam. Just my cam and experience I thought id share
12-26-2013, 08:41 PM
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The range will roughly be from 3500-7000
You're using stock pistons in your lq9 though, right?
Down low doesn't really matter me, it needs to be a mid-high range cam
Im running a 234/250 .621/.629 112+4 on a stock bore/stroke lq9. Made solid torque from 3300 on to 5600 and hp peaked at 6800. Stock ls3 heads and a victor jr intake. It isnt lazy down low like people say but really pulls hard from 5k up. I had to flycut for the cam. Just my cam and experience I thought id share
Down low doesn't really matter me, it needs to be a mid-high range cam
12-26-2013, 09:13 PM
#6
I don't road race, but I assume you use a manual transmission. And, even though I don't have any road race experience, I believe you all need good mid-range torque coming out of the corners right? If I am right about that, I would be careful getting cam advice from drag racers. Our needs and situations are quite a bit different from yours. And, drag racers and street/strip guys are mostly who is in this forum.
In general, most road race cams for smaller tracks that I have seen tend to have a wider LSA to broaden the RPM range and they tend to use much less aggressive lobe profiles to bolster valve train stability and endurance. I think in this case, you might contact Engine Power Systems.
http://www.engpwrsys.com
