I have a freshened SBE gen 3 LQ4 with ARP rod bolts. I plan on running LS3 heads, BTR .660 springs and TI retainers, stock rockers with trunion upgrade, Holley hi-ram, ARH 2" primary headers with 3.5" collector, and a 250 shot. Its going in a 2600ish lb foxbody drag car with a TH400. Any suggestions would be appreciated.

 

The challenges with this combo is limited piston-to-valve clearance and relatively low static compression. Your choice of intake manifold and headers both lend themselves to a higher RPM range, but your piston-to-valve clearance and compression do not lend themselves to the ideal camshaft. However, with that said, a 250 shot of nitrous can fix this problem right up.

Fortunately, Cam Motion makes a camshaft exactly for what you are doing. Here it is:
http://store.cammotion.com/junkyard-...-port-camshaft

I would not recommend milling the heads any more than a .005" cleanup pass using this camshaft as valve clearance is limited. In your #2600 car, this combo should be stupid fast. Lightweight combos like this have gone mid to low 6s on motor and well into the 5s on nitrous in a well tuned car.

 

With your static compression, Holley Hi-Ram, 2" primaries, LS3 heads, and whatever huge *** cam you'll be throwing at this, it will be a DOG below ~4200-4700 RPM depending on cam.

 

Thanks this is exactly what I was looking for. The choices for the intake and headers are for a later date when I can afford a built engine.



I'm not worried about low end as this car will only see track duty and will have a 4000ish stall.

 

I ran a similar cam as to how speed trigger mentioned.. it was a 230/244/114lsa...

 

If it's a track only car with a 4000ish stall, then that cam Speedtigger posted will fit the bill.