I was suprised my rwhp was as high as it was compared to the torque. My guess is that the heads are flowing really well and the cam is strugglin to keep up.

381 rwhp @ 6200 RPM
349 rwtq @ 4600 RPM
tq stayed in the 340's from 3700-5200

-Heads are Lt4 ported stage II
valves 2.02/1.585
flow at .600" lift 295.4/210(is the 210 exhaust a little low for an LT1 or right on?)??

-Cam is LT4 HotCam(hydrollic roller)
Duration @ 0.050: 218/228
Lift: .525"/.525"
lsa: 112
RPM Range: 1500-6000

-First of all, are the numbers I put down reasonable/normal, as far as the difference from hp/tq?

-What could I change to bump them up more, especially the torque(cam?)?

-If cam, what specs make better power, witha powerful rumble, but without haveing to change springs, ect. every so often(10k)?

 

you could run a much bigger camshaft which would give you alot more hp and torque. you should look into something like a cc306 or a 230/236 xe from comp cams. with those heads flowing as well as they do, you could really benefit from a bigger stick!

thomas

 

More compression! I'd try to bump it up at least 11.5:1. That'll bump that torque up pretty good.
Kevin

 

Those are very good flow #'s, a good 10% better than my heads. I've got the CC XE224/230 and have the same HP # at a lower rpm, but have over 100 ft lb of torque on you. My tq curve is very flat from 2500 to 5000, then starts to fall off. You would benefit from a larger cam. I think those are good lt4 hotcam #'s

 

any other advice? I've also heard if I was running too rich my tq numbers could be suffering. Is this true? Other cams anyone else has tried that I could see good results from?
ttt

 

I agree that a bigger bump stick is in your future. Get that compression up to get those torque numbers up.

 

nice numbers john
You think u can beat my car ! ?
We need to run em ASAP. I think its goin to be really close.
Marcin

 

If you are looking just for a max torque number, more cam will get that, but where do you run your engine? If it's 3700 (after a shift) to 6200+, maybe you don't want to sacrifice too much of that mid range torque.

You probably need a cam with more lift, but not much more duration. What good are those .600 flow numbers with only .525 lift? There are aggressive hydraulic roller cams that can achieve that and give you quite a bit more torque (and therefore power). Rich Krause might be a good one to ask about that.

 

yep

 

testing the sig now

 

Took the words right out of my mouth, almost verbatum. Or maybe I took them out of yours (mean the advanced regulars )

Guess they havn't changed much in 40 years huh


Anyway, i obviously agree-
MORE LIFT! your not utilizing your heads.

and yeah typically according to smoke- about 75% exhuast flow is ideal relative to intake. Then again the exhuast is being forced out under pressure so it changes the name of the came- a lot like the intake portst of heads for a blown motor Id imagine.

In exhuast ports, from what i read/told/understand- and hopefully someone will correct me if i am wrong- its more about the shape of the port and volume than the flow numbers for exhaust.

 

Exactly. He needs heads to take advantage of those flow numbers. An XE230/236 would be a nice choice. You should see 400-410rwhp easy with that cam. Lift is only good to .556" (exhaust) and .544 (intake), so maybe you could have a custom grind with more lift to match the heads. I would think thats the way to go. Mmmm...custom grind