Forged 347 nitrous block limit?

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Oct 15, 2009 | 07:09 AM

n20z28

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From: fort Smith,AR

Forged 347 nitrous block limit?

Ok guy let's here some numbers or thoughts.. I see guys getting ballsy spraying 250 on stock shortbkock.. So what's the limit of forged? Or what u guys think my setup limit is... All numbers assuming goog fuel and system and good tune... My setup is what's in sig.. Plus short block is stock crank, h beam eagle rods, forged je pistons( nitrous gap rings and clearence not fir sure if they all out nitrous pistons) new gm mls gaskets head studs.. And Orc heads roughly 11.1.... I'll be using dp/ with stand Aline and single nozzle up front for another stage.... what's actuall stock block and crank breaking point?

Oct 15, 2009 | 09:43 AM

99_Z_155

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From: Englewood, CO

assuming you know whats going on, i would be comfortable with a 175 or 200 progressive shot. stock rear end?

Oct 15, 2009 | 11:33 AM

JL ws-6

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If you know what you're doing, and the heads are tied down with the good L19 studs and the deck is thick enough to hold everything (stock castings won't be) you probably can put 350 to 400 to a properly built 347 as long as you break it up into 2 stages, and again, know what you're doing with the tuneup (right plugs, fuel, timing, fueling, etc)

Hopefully.... the rest of the car is ready for that too and all your safety stuff is done.

Oct 15, 2009 | 11:38 AM

ls1408cp

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just go iron

https://ls1tech.com/forums/lsx-parts...hke-370-a.html

Oct 15, 2009 | 01:56 PM

n20z28

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From: fort Smith,AR

8.8 rearend built... Yea I have ran 400 shot on built stock block sbc with my tune ups... Not for sure what headstuds are in this one..... Prc 2.5 heads

Oct 16, 2009 | 04:11 AM

JL ws-6

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The prc heads are what bother me, that's a stock casting, and it may not have the deck thickness to hold the pressure.

Oct 16, 2009 | 10:50 AM

Twotonefreak

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From: Southeast of Disorder

nevermind

Last edited by Twotonefreak; Oct 16, 2009 at 10:57 AM.

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Oct 16, 2009 | 10:57 AM

Twotonefreak

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From: Southeast of Disorder

Not you JL. The OP. Sorry about that.

Oct 16, 2009 | 11:03 AM

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JL ws-6

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No problem

Oct 16, 2009 | 11:57 AM

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Twotonefreak

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From: Southeast of Disorder

I didn't feel starting any drama in his thread. I'm in a good mood today.

Oct 25, 2009 | 12:47 AM

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n20z28

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From: fort Smith,AR

shut up Jared.... lol how ur ta running

Oct 25, 2009 | 02:53 AM

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jmill96Z

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From: Movin' On Up

I'm thinking the limit on my setup is around 400. My tune up right now is extremely safe on for a 300 shot. Haven't gotten to lean on it yet. I have a fairly similar setup as the OP.

Oct 25, 2009 | 06:23 AM

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BADBOYZ28

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From: Harlingen, TX.

I was told by LME mine could hold a 300 shot no problem assuming all supporting mods are there. I'v done a 150 & 200 shot so far.

Nov 3, 2009 | 05:40 PM

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Lythropus

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From: South Carolina

Quote:

Originally Posted by JL ws-6

I agree I've seen safe 400 shots on built cars but these are definitely not street cars!!!

Nov 3, 2009 | 08:29 PM

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Twotonefreak

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From: Southeast of Disorder

Quote:

Originally Posted by n20z28

shut up Jared.... lol how ur ta running

It's running. Working on getting the suspension lined out. It doesn't like launching now.

Nov 3, 2009 | 09:42 PM

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BillyBob750

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From: Lexington, Kentucky

A friend of mine has been 9.30's with a 347, on two kits..

Not sure the horsepower though.

Nov 10, 2009 | 07:11 PM

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BAKED

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Quote:

Originally Posted by BillyBob750

A friend of mine has been 9.30's with a 347, on two kits..

Not sure the horsepower though.

I think I know that guy....

I don't dyno it anymore so not sure what it's making at this point but it has made a little over 700 on one big kit.

Sunday I hit it with about a 400 shot and it held it like a champ. The car didn't 60' like it usually does or we would have had a new stock cube record.

I did trap 118.69 in the 1/8th though. That's a new PB for me.