AnthonyLMBD

Hello guys, I'm wondering the amount of horsepower I'm going to be making out of an LQ4 block. I have 821ported Ls3 heads being matched ported to the Victor Jr intake. I'm also installing a street/strip comp cam Lift: .581''/.588'' Duration: 273°/279° Lobe Separation Angle 114°RPM Range: 2000-7000. I have 1 7/8th long tube headers made by stainless works. I don't mind putting nos. I want to make good numbers for a little S10 street truck. Also looking at diamond pistons.

NAVYBLUE210

500 FWHP or 500 RWHP? Auto or manual? Duration #s @ .050 would be
helpfull. Stock LS3 Heads seem to work best with +12*-16* Exhaust Split
(especially with N2O!) from 6000-7000 RPM.
At least 10.5:1 if not 11.0:1 compression as well.
My .02

AnthonyLMBD

Thanks navy! It's auto built th350, but building 4L80 on the side. 373' gears, and rwd. Do you recommend another cam? Is it possible for the 500? Forgot to add 750 Holley carb .

NAVYBLUE210

500 FWHP maybe, 500 RWHP not with that cam.
your driveline will consume 120+ FWHP.
what are .050 #s, & Compression?
look at speedtiggers builds/threads and talk with
Kip @ Cam Motion

AnthonyLMBD

Okay thanks! Don't know much about cams. Saw that one at a good price. Im still looking at cams, thanks for the help! Hopefully I find the right cam.

Darth_V8r

iTrader: (4)

If that's the cam I think it is, it won't rev. if I had to guess I'd say comp XER273 cam?

That 273/279 is .006" lift. More like 224/230 at .050", which is really kinda small for a 6.0.

You want that kind of power all motor on LS3 heads, you need to be looking at 239/251 at 0.050" type cam specs. Use a 112 LSA and advance two degrees. Then, raise your static compression to 11.5 minimum, but 11.7-11.9 more better if you have access to good gas.

AnthonyLMBD

I spoke to TSP what about a 231/236 cam at at .640/615 lift 112LSA

Darth_V8r

iTrader: (4)

That's much better - especially the lift numbers. But I still think you'll want more exhaust duration. Even if you want to stick with the 231 duration, you'll probably want 241-243 exhaust. Especially given these are stock castings, which tend to be very intake flow biased. If you're wanting the cam to be smaller to reduce overlap and make it easier to drive, I get that. Something like 231/243-114+2 would really match up with your heads and intake better.

Keep in mind, when you're thinking 500 at the wheels, you're also thinking close to 600 at the flywheel. On a 6.0L, you're going to need RPM to hit that kind of goal. You're a lot less likely to get there by building torque early and then peaking at 6300 RPM. Need to be thinking 6800-7000 RPM as a HP peak, which means a 47-48 degree IVC and short runner intake. you've already got the short runner intake with the Vic Jr.