Marcello7x

iTrader: (10)

Ok, so after looking at many dyno sheets from ls1's make over 400rwhp i figured i could hit it with my lm7 before spray.

First off has anyone hit 400rwhp here on the tech? I know most people usually run the ls1 or lq4/9, and not many people put as much work into the lm7's on performancetrucks.

If i can't hit 400 what do you guys think i will fall in at. It will have a dyno SD tune and the following parts:

Super vic intake
4500 edelbrock throttle body
LT's to cutouts[for racing and dyno only]
torquer v2
comp 918's
Home ported 862's with .030 milled to bump compression
rod bolts
Supporting fuel system
Through a t56

Regardless the car will be a beast, w/ or w/o spray since its weighing in under 2000lbs right now. But i'd like to hit the 400 mark.

tripblackls1

iTrader: (11)

your setup is a bit mismatched but i would say optimistically 370-380 rwhp on a dynojet

tripblackls1

iTrader: (11)

also dont really worry about hp #s when my car making 335 rwhp (at 3150#) i was able to pull of a 11.9 in the quarter
which was a lot faster than many other fbodys with much more hp that day

Marcello7x

iTrader: (10)

I know my intake and tb are a bit overkill. But i figured the torquer v2 will like to be spun up higher in rpm in the 5.3 vs the 5.7.

Im assuming that what you ment by mismatched?

tripblackls1

iTrader: (11)

low flowing heads with small vavles, mid sized cam, and a high rpm intake that will kill bottom end
so bascally your heads will restrict high rpms, and you intake will kill bottom end leave a small power range
but in a light car i doubt it will be noticeable

tripblackls1

iTrader: (11)

I say more head and more compression to take full advantage of your cam and intake

Brian Tooley Racing

iTrader: (13)

Here's one making 490 hp (crank) with a stock LS2 intake and TB. Another one made 500 hp with the same TFS 205 heads and a Fast intake.

https://ls1tech.com/forums/generatio...205-heads.html

Why such a large TB?

Marcello7x

iTrader: (10)

Thanks for the advice guys. Nice to see it has been done.

I planned on raising my power band in the rpm range since I am real concerned with traction. I figured the intake and cam would do that quite nicely. The current 862 heads I plan on running will hopefully be ported well enough to get some decent flow numbers, that is of course 100% dependent on my learning to port quickly, but im a quick learner. I built a hotrod from scratch to first test drive in 6 months, having never done any real structural welding before[patting myself on the back now] Anyways I figured I could get a decent flow from the 862’s enough that it won’t choke me too much.

Also the tb is so large because I got a good deal on it and couldn’t say no! Less than I’ve seen any 4150 tb sell for.

Im sure regardless of the numbers it puts down, I will be more than happy with the result when I hit the gas, but my buddy called me out on not being able to hit the 400 mark.

sman

iTrader: (4)

370 at best.

My numbers and parts are in my sig.

ZONES89RS

iTrader: (25)

You have a good tune? Sure the converter would be causing lower numbers, i assume unported 5.3 heads?