prochargedpony

iTrader: (6)

I have a 6.0 with untouched 317 heads, ls6 intake, 90mm throttle body, custom grind pat g cam, long tubes, and a 6 spd, behind a moser. I have made 440/417 is my best run. Car runs excellent for what minor mods it has. I want to push the envelope on my 6.0, So I was going to do LS3 heads, a fast 102r, 1 7/8 long tubes, and a 102mm tb, and have another custom grind cam done.

So my question is, who has come close to making 500 rwhp, out of an NA 6.0

PREDATOR-Z

A great set of heads like TFS

WSsic66

iTrader: (2)

* dont quote me

patriot stage 3 heads
trex cam
fast 102 intake
ls7 lifters
1 7/8 headers


around 500 horse
someone ran this setup on here somewhere but then installed nitrous

tumadre

http://www.carcraft.com/techarticles...ads/index.html

c0ncEpT

iTrader: (4)

^ This.

Advanced Induction has gotten there with 243 heads but its going to be much easier to achieve with a set of aftermarket casting heads like the TFS.

Sprayed1998

iTrader: (10)

Good Heads
Well Matched Cam
Light Valvetrain
1 7/8-2" Headers
3" Exhaust/Cutouts
Fast Intake
Good Tune

Camaro99SS

iTrader: (4)

If you haven't yet, see these 2 links for Patrick G's 347 build that eclipsed 500rwhp. He did it 4yrs ago with Mamofied AFR 205's, ported FAST 90, 11.9:1, and a cam similar to a Magic Stick 3. Now there's the FAST 102 and with your 6.0, it'll be even easier. The real kicker here is that this type of combo will be more driveable on the street than most 450rwhp h/c combos running hogged out OEM castings with a big cam.

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

This is a snapshot of all the details.

http://guerragroup.com/2000TA.htm

Jason

s346k

iTrader: (4)

i don't see why it couldn't be done with some milled l92s, a gm l92 intake and decent sized cam.

180ls1

iTrader: (4)

a ported fast 102/102 combo, the nastiest heads you can afford and maybe a new cam to optimize the new setup.

Or a 75 shot would be very safe and do the trick also.

garygnu

some stock l92 heads from SDPC($375 each).a fast 92mm intake combo,and a CAI system.and call Patrick-G for a cam.

SnIpEz

iTrader: (4)

The heads are definitely you weak link, look at some AFR 205's or some TFS and you'll see a vast improvement. Why do you want to change the cam exactly?

Patrick G

iTrader: (14)

I would not recommend L92 heads if you have your heart set on 500rwhp. The L92 heads are excellent, but they have a hard time getting to 500rwhp with a 6.0L. Reason? The huge 2.165" intake valves are very close to the combustion chamber wall and cylinder bore which really hurts power. You don't see this shrouding hurt it as much on the flow bench as it does the dyno (and track).

There are dozens of 6.0Ls that have made over 500rwhp with a quality cathedral port head like an AFR 230V2, PRC 227, TFS 225, or MAST 225. These coupled with a ported FAST 102 and a cam in the upper 230s will do a good job in getting you there.

There are hardly no 6.0L combos spitting out over 500rwhp, even with flycutting, higher compression, running stock or ported L92/LS3 heads. Valve shrouding is a killer. If you can be happy with 460-470rwhp, then the L92/LS3 heads work great when cammed correctly in a 6.0L.

Advanced Induction

iTrader: (2)

Your 317's can be modified such that they're essentially 243's, so if they are currently unmolested then you already own the casting to make 470-500rwhp, with none of the draw backs of aftermarket casting based heads.

prochargedpony

iTrader: (6)

I was hoping for 500 with the l92's, but If I can do it with a set of trick flor or afr's I will. I am making 440rwhp right now with one of your cams, and untouched 317's through a 9inch so the 460-470 hp is not worth even swapping over. Guess it is time for me to save up alittle more. I have 2200 saved right now.

gectek

iTrader: (2)

Besides price point and maybe a different rocker setup or longer pushrod (which basically boils down to price point), what are any drawbacks of an aftermarket head vs a stock head?

Paul57

I thought the 317s and 243s had nearly identical flow in stock form?? The big difference was the combustion chamber size???

Advanced Induction

iTrader: (2)

Weight - many add 15-30lb to the nose of the car above CG
Guides - the service life of bronze guides is a fraction of the typical OEM guide
Components - the OEM parts are typically much lighter
Fitment - nothing has a higher probability of simply bolting back together & working well than OEM parts
Value - Same or higher output, longer service life, lighter parts, guaranteed fitment, and at much lower cost makes the CNC'd GM head a no brainer

The main trouble people get into is picking a hp # they think they must have. If performance is the goal, they need to stop the "I gotta have 500rwhp, 485 will be dissapointing" madness. Rarely does the car with the highest dyno # run the best. The entire setup needs to cater to the application - if the area under the curve needs to be focused such that we trade a few high rpm #'s for something in the lower rpm range, then so be it. That is, if your goal is performance potential designed around how you actually use the car vs. dyno racing. The latter is focused on because it is easy. There is no shortage of ways to make a dyno sheet with whatever # you like, if that is the vehicle's sole purpose.

I do not recall what the 317's flow in stock form - that isn't something we really take into consideration. Physically we can cut the 243 programs in the 317's, and as mentioned we can simply alleviate the only drawback of the 317 (ls1 style chamber) and correct it to 243 or better characteristics.

bayer-z28

iTrader: (14)

I third this..

Ahhem..
Granted this is an 04, but still. He's NOT far off! Very impressive numbers for a "modest dyno."
https://ls1tech.com/forums/dynamomet...lt-04-gto.html

gectek

iTrader: (2)

So you are saying that you would use a stock gm valve in a head that you cnc? Is durability of the valve in stock form as good as aftermarket, or do they help the flow characteristics as much as an aftermarket valve does?

I am curious to see a 243 head match up against a trick flow in as cast form, or in cnc'd form. When both have their magic worked on them. And I am glad that the darts I had had bronze guides instead of the iron ones. If they were iron and the valve bent, it would have cracked the head. Instead the bronze just deformed and a small piece is missing where the valve stretched it out.

The points always favor which side you scrutinize and specialize in i guess.

As far as weight, the thicker deck is there for a reason. Can you say that an aftermarket head has had as many reported problems of warping/pushing water than the LS3 heads under boost? How much more durable is a stock head then than an aftermarket. Esp when you redesign the chamber and make that portion of the head even thinner? And mill them.

ZOsack

iTrader: (2)

This is good stuff