TwoTransMan

iTrader: (5)

I currently in the process of building a 408 stroker with a set of P/P L92 heads.

408 Iron Block
L92 Heads P/P
Callies Compstar Rods
Callies Stroker Crank
J/E Pistons
200 shot
Camshaft Custom Cut By Comp Cams I don't have Cam Card
TSP 1 7/8 Long Tubes
T56 Spec Stage 5
Pro 5.0
9in 4.30
All supporting Mods such as fuel and bolt on's are include


I was wonder if some members on LS1 Tech could help me out and see what intake I need to use and if anyone on the board is making 500 to 550 RWHP with this combo? I know it would be nice to have a set of AFR 225's on top of the 408 but fund's are limited. If the combo I have is not going to see that or close I could use some "HELP" to find my way to a possible 500+ RWHP build.
Thanks

TwoTransMan

iTrader: (5)

Sorry I forgot to put down thats 500+HP on motor only and Nitrous numbers if anyone would be willing to take a shot and guess for me.

Gordon0652

iTrader: (4)

I think you could make 500hp at the crank with that setup pending on cam.

TwoTransMan

iTrader: (5)

Could it be done at the rear wheels? I wish I had the Cam Spec's so it could help out, I have been looking around and all I find are people making around 485HP and 460TQ

LSGunZ28

iTrader: (8)

why the hell cant he make 500+rwhp through a 6 speed and 408?

Im sure he can with just a 402 and that setup, no? as long as he ha the proper intake manifold and his l92 heads are PNP and depending on what cam and CR.. very reachable id say..

TwoTransMan

iTrader: (5)

I was thinking the same thing but I have not seen anyone making over 500 but I have no doubt in my mind that this is reachable with this combo. Anyone have a link to a similar build that is making his power?

1.8t

Well, considering I am making the numbers in my sig on stock L92's and a stock LS3 intake mani on 376ci, I don't see how a 408 wouldn't eclipse the 500rwhp mark.

QAG98SS

My 98 SS with a 408, cnc ported l92s, stock l76, and a ms3 cam (237/242) did 505/470. My car is a m6 with stock 10 bolt.

kyles2000z

iTrader: (8)

people can make over 500 n/a on stock cubes. of course you can make 500 on 408

Black FormulaLs1

iTrader: (10)

i am going to try and get 480+ outta my forged 346..most mods in sig

TwoTransMan

iTrader: (5)

What intake should I use????

06black6spd

ya should be no problem

Black FormulaLs1

iTrader: (10)

06black6spd how the hell are you runnin a 12.4 with over 450 rwhp and 421 tq, AFR's etc.....wait nvm...i see the 60'...check my old mods and time in sig

Apollo0526

iTrader: (3)

My 02' ls1 with headers, cold air, tuning it myself with hp tunners, and drag radials i was cutting 12.2 @ 114 with 1.8 60' M6 btw dyno at 349hp don't remember the tq#'s

shazow1969

iTrader: (3)

Gregg it's also a GTO which is signifigantly heavier than an Fbody. And he was on the notoriously not so sticky Nitto DR's. Since I don't deal much with GTO''s either I am not sure if there are any after market ring and pinion sets available for it. But some stickier meats and a much better launch should get him into the 11's.

For example a typical 3rd gen can weigh anywhere from 2900 to 3500 depending on options/accessories. The Base GTO (which they all pretty much came loaded save for a few comforts) started at 3750. If you put that same 457 whp drivetrane in a 3000 pound Berlinetta and you're running deep into the 11's even with minor traction difficulties. It's called Horse power to weight ratio. And this is why you will be looking at 3rd gen taillights when we race all Motor.

I'm sorry guys I didn't mean to thread jack this so I'll throw in my opinion on this. YES you can definately get 500+ WHP out of a L92 headed 408. It's all in the Cam and intake at that point. The More air you can get into and out of an engine the more power you make. Now the Limiting factor is gonna be how aggressive you want the cam to be If this is an all out race car Go for broke. but if it's your Daily that you are just planning on racing go a little less aggressive shoot for 450-475 whp and spray the rest so it will be a little more user friendly.

-Kevin

mike c.

iTrader: (1)

My 402ci w/ported l92's stock l76,m6 car got 517hp 468tq,12 bolt w/4.11's on a stang dyno. I run 10.8@128mph in a 3,700lbs ws.6. I switched to a new cam from LG Motorsports g6x3 and gained more. I will re-dyno with this can in about two weeks.

firefighting1101

iTrader: (48)

for now a ported l76 will be all you can run, unless you want to go single plane gmpp or a custom sheetmetal intake. as far and best bang for the busk...a single plane with a carb style intake will gain you the most power for the money, but its a radical setup and most people dont want to go that route. i went sheetmetal!

krazy4

iTrader: (5)

You should hit 500whp pretty easily.

200 shot should add 200whp or 200fwhp depending on the jetting.
Most of the systems are either over or under that number though. For example, my supposed 100 shot gained me 124whp. LOL I just called it a 120 shot.

LS6427

iTrader: (2)

Its been done many times already. But with 416ci's/L92/L76 intake and TB, a couple cars I know are making 520-526 RWHP. Pump gas, 11:1 cr and rather medium sized cams in the upper 230's. Nice idles.

PM me if you want.

firefighter813x

iTrader: (6)

Sounds like a nice build. One day I'll be in the 500+ club too.