ZONES89RS

iTrader: (25)

Any guesses of what a 6.0 LQ4 with home ported heads milled to get 10 to 1, 1 3/4 full lengths, dual 3 inch with 1 chambers, victor JR intake, custom built 800 pro form carb, drive train is T56 and moser 12 bolt with 4.30s, looking for 450+ RWHP, but i have heard of bolt on LS1s with unported heads making that to the ground.

01wssick

iTrader: (27)

I've heard of ls1's putting down 420-460HP depending on mods with stock cylinder heads. their is a guy on here that was making 500-510HP with AFR cylinder heads.

ZONES89RS

iTrader: (25)

On a LS1?

SOMbitch

iTrader: (8)

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

Great thread. FWIW 420rwhp on a stock headed LS1 is the exception not the norm......

ZONES89RS

iTrader: (25)

All i really learned from the first two pages is that it is a good thing i have a Victor JR and not a plastic EFI setup.

Longshot LCMS

iTrader: (1)

420-460 on stock heads? No. Maybe some ported and milled stock heads with a HUGE cam... and that's MAYBE. In fact 420 would be the ragged edge of that.


OP, I didn't see a cam listed... With a big Cam then maybe 415whp would be attainable, but with a stock cam you probably wont see more than 350whp.

EDIT: I just saw the thread title... T-rex cam... probably 425-420whp would be my guess. Make sure you have sufficient PTV clearance with those milled heads and that cam. You may need to flycut. If I'm not mistaken there's maybe a fingernail of clearance with the stock heads, with yours milled you will likely have no choice.

ZONES89RS

iTrader: (25)

We are talking a 6.0 with dish factory pistons and 317 cast heads so even milled they are not as small of a chamber as a LS1 head, and i am using a victor Jr intake not a plastic piece.

Longshot LCMS

iTrader: (1)

Ok I was thinking stock LS1 241 Heads. You're probably right, you'll be ok and not have to flycut. I think running that cam though I'd probably still consider it. That intake will help, but it can only flow as much as the heads can take in and push out. Might actually be overkill. Either way, my guess is still 410-420whp.

bayer-z28

iTrader: (14)

PatG is the MAN! I've got his Tq Cam with a set of worked over LS6 heads an a Texas Speed tune running 414/372 rw on crappy SLP "Tuned Length" LT's and an LS6 intake. Gonna get it re-tuned here as soon as spring hits. Needs a little more fuel down low.

I'm noticing that a lot of the power to be made is in the head design and the size of the intake. And a low restriction exhaust helps, but that goes without saying. The main problem is getting the air TO the heads.

I'd guess 430 rw.

ZONES89RS

iTrader: (25)

Exactly, and i think to the heads the victor intake has it where it needs to be.

My buddy with the same cam and cubes said he made 492 rwhp, but he also had a bit more compression and i dont remember what heads, shooting for 450 and i will be happy with that but i am thinking it might be a bit more.

Longshot LCMS

iTrader: (1)

I really don't see how that's anywhere near possible. If that were the case everyone would run this magic setup.

venom ws7

iTrader: (13)

450rwhp with 10:1 is gonna be hard IMO...

We made 435rwhp Trex stock LS6 Heads + fast 90setup with A4 3500 stall and 3.73
We also made 410rwhp with M6 Car trex Boltons (no fast) and 317 70cc heads if these heads were milled or a little ported I'm sure we can get 450+rwhp with fast..

IMO You can get 430rwhp with that rearend.

Good luck and keep us posted..

slow trap

iTrader: (22)

are you going to use a 90* elbow or a 4150 style 4 hole throttle body ? if using the 90* you may be sadly dissapointed and wish you were using the better (highly debatable) fast plastic design.

ZONES89RS

iTrader: (25)

I will post the results when it is said and done, dont know when it will make it to the dyno but it should be running by early next month. Dont know how much power a 12 bolt robs over a 10 bolt, but if it made 430 i guess i coul chalk it to the game.

It is going to be carbed, that should mean more peak power. Most carb swaps over injection i see can pick up to 25 more HP than the EFI, so i am holding that in my corner, the hold back for me is the swap headers are 800$, o ****** way i am paying that for a set of headers, found some bad *** mid lengths.

fatmat80

A freind of mine is running the trex and a ported fast 90/90 and he put down 435rwhp and like 405 or 410 rwtq through a m6 and 9 inch..stock untouched 241s...

car in action:
http://www.youtube.com/user/deanh8#p/u/21/_7g_ARUDVSs

slow trap

iTrader: (22)

It is going to be carbed, that should mean more peak power. Most carb swaps over injection i see can pick up to 25 more HP than the EFI, so i am holding that in my corner, the hold back for me is the swap headers are 800$, o ****** way i am paying that for a set of headers, found some bad *** mid lengths.[/QUOTE]

yeah,headers for the 3rd gen swap are crazy. i was contemplating dropping my 408 in a 3rd gen but adding in all the $ for the swap i may just try to lighten my 4th gen junker instead. maybe try some .040 cometics to raise up that compression will help . if both surfaces are clean and flat leaking water won't be an issue and a tighter quence is definitely a + .

ZONES89RS

iTrader: (25)

That is what i would like to do, if the budget allows, but i have had a couple say to not use cometic. LS2 gaskets will probably get the go ahead, but i would love to use the thinner pieces.

ZONES89RS

iTrader: (25)

Daaamn, was the on motor? My buddies 6.0 powered 79 malibu did 11.58 at 117 with a stalled TH350 and 10 bolt, so i have to know if that was an pure nuts, 100 shot of gas maybe? Know the 60 looked like **** on the video.

Numbers like that from a LS1 with a 9 inch make me reassured i will like my results.

fatmat80

all motor, he is still dialing in suspension..60 times will be better next time out..