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Thread: Stock Ls1 block strength
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05-25-2010, 09:56 PM #1
Stock Ls1 block strength
Stroked my motor to a 383, forged bottom end about a 9:1comp, turbo cam, AFR 225 heads, and my GT 88mm turbo is on the way. My question is what is the Ls1s blocks capabilities? I've heard before my build they can take about 1000 from a few pep. Now I got nervous and have been doing some reading and have been seeing recomend Iron block for over bout 750hp. Anyone running that kind of power on an ls1 stock block???
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05-26-2010, 03:14 AM #2
I believe that the stock bottom end weak link is the rods & rod bolts. Not the block.
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05-26-2010, 08:49 AM #3
- Join Date
- Apr 2001
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- Surf City, NC
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Black/Screaming Yellow- 99 S/C TA WS6 & 04 Cobra
I still use my stock block but I am only around 550 rwhp or so. They have lasted into the 1000 hp range and just what Bill said it was the block that was letting loose. I think you will be fine. Just don't skimp on the fueling for it and use methanol for added protection and you will be fine. How much boost are looking at throwing at it?
1999 Trans Am WS6 Black - Forged 346, P1SC (8psi), TH-400, and 12 bolt(3.73's)
10.29@129 w/1.60 sixty foot
2004 Screaming Yellow Mustang Cobra - Whipple 2.3, Exhaust, & CCW's...My DD
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05-27-2010, 11:17 PM #4
Yeah I plan on using meth inj. I am going to try and run as low boost as possible because I still have the stock 4l60e and really don't want to try my luck and break over 550rwhp on that trans. But I eventually would like to run anywhere between 16-20lbs.
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05-28-2010, 03:45 AM #5
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- Surf City, NC
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Black/Screaming Yellow- 99 S/C TA WS6 & 04 Cobra
The main limiting factors with these cars are the stock rods and pistons but you are going forged. So you are taking that out of the equation. Then the trans and rearend. If you go fi don't skimp on fuel stuff either. Just start off with dual intank pumps delete your intank reg. and get aftermarket rails with a rail mounted regulator. That will get you started in the right direction. If you are planning to do meth as well than you will be ahead the game with that as well. Good luck with your build.
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05-28-2010, 08:27 AM #6
M6 car with an aluminum block... 900ish RWHP and you will be on the edge of pushing water (lifting the heads). THIS is the real limit.
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05-28-2010, 10:55 PM #7
Yeh I'm def all fuel upgrades. I need to try and find a used standalone ems too so if you anyone know where i can get a cheap one let me know!! And thanks for the support. Should be finishing the install tomorrow and wil let you know how it goes!
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05-29-2010, 02:55 AM #8
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05-29-2010, 08:58 AM #9
I just always heard standalone engine management system haha. But I talked to the tunning shop and they said they could tune it but it would run into problems like it would throw my my car into limp mode. But if I get a new map sensor you think that would take car of it??
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05-29-2010, 08:29 PM #10
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05-29-2010, 08:54 PM #11
Definitely... that 900 is not in stone though. If your tune is aggressive it may happen in the 700s. If things work for you, you may make it to middle 900s.
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05-30-2010, 04:47 AM #12
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06-08-2010, 07:50 PM #13
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- Mississippi
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black- 1966 corvette
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