441 LS7 and a 150 shot?
10-09-2011, 10:51 PM
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441 LS7 and a 150 shot? I just ordered a new LS7 block and need to figure out which rotating assembly I'm going to go with. Whatever I do the parts are going to be callies crank/rods and Wiseco pistons. I want to spray a 125-150 shot on the engine and want to know if going with a 4.125" crank/pistons(441ci) would be risky at 7k rpms..or if I should just stick with a 4" crank and go with a 427 ci setup and and hit it with a little more nitrous. I most likely won't ever go past a 125 shot but would like to have the option without worry. Thoughts on this?
10-11-2011, 11:07 AM
#4
Yeah but your stock cylinder walls are thicker than LS7 walls.
I found this out just recently also.
The cylinder walls are known for cracking at the top with a slight hit of detonation.
I think you might be ok with a 150 shot but not much more. You would need to make sure you have enough piston crown and know where your ring pack is on the piston.
You would do better just getting a re-sleeved block from ERL.
I found this out just recently also.
The cylinder walls are known for cracking at the top with a slight hit of detonation.
I think you might be ok with a 150 shot but not much more. You would need to make sure you have enough piston crown and know where your ring pack is on the piston.
You would do better just getting a re-sleeved block from ERL.
10-11-2011, 12:06 PM
#6
LS7 stock block is pretty much good for nothing.....except N/A.
You will split the tops of the sleeves if you spray it. Maybe you'll be ok for a little while if the tune is PERFECTION.......
If you wanted to spray an LSx type stock block....you should have bought a cheap *** iron block LQ4...maybe $600-$700...build it to 500 RWHP and then spray it all day.
.
10-11-2011, 06:56 PM
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Too much isn't the question.....spray none and you'll be ok.
LS7 stock block is pretty much good for nothing.....except N/A.
You will split the tops of the sleeves if you spray it. Maybe you'll be ok for a little while if the tune is PERFECTION.......
If you wanted to spray an LSx type stock block....you should have bought a cheap *** iron block LQ4...maybe $600-$700...build it to 500 RWHP and then spray it all day.
.
LS7 stock block is pretty much good for nothing.....except N/A.
You will split the tops of the sleeves if you spray it. Maybe you'll be ok for a little while if the tune is PERFECTION.......
If you wanted to spray an LSx type stock block....you should have bought a cheap *** iron block LQ4...maybe $600-$700...build it to 500 RWHP and then spray it all day.
.
Hmm...I just really can't see the block not being able to hold UP TO a 150 shot..theres guys running 15psi of boost through stock LS7 blocks just fine. And if I wanted to do a cheap rebuild I would of just kept my LS2 swapped pistons and went that way. I don't want an iron block in my car and I want to be close to where I was in HP when I had the 88mm turbo setup on the car. Im looking to make around 725whp said and done.
Does anyone with actual experience have any input they can give me? I appreciate the opinions but one person will tell you one thing and another person will say something completely different...like a stock block LS2 wont hold more than 600whp with boost and someone else will tell you(me-from experience) it will hold 733whp all day long.
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10-11-2011, 07:36 PM
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To be honest, ill never be running a 150 shot unless im at the track. A majority of the time ill be running a 100 or maybe a 125 shot.(with the power I should make on this engine, I don't see why ill need more than a 100 shot)
Before I was turbo'd I had a stock block LS2 with a nice cam and stock heads and with a 125 shot and I cleaned up pretty well. That was making 503whp with nitrous and this engine should make more power NA. I might run a 150 just to make a good number on a dyno and maybe if im close to a 9 second pass(very close) I might up it just to get there.
Before I was turbo'd I had a stock block LS2 with a nice cam and stock heads and with a 125 shot and I cleaned up pretty well. That was making 503whp with nitrous and this engine should make more power NA. I might run a 150 just to make a good number on a dyno and maybe if im close to a 9 second pass(very close) I might up it just to get there.
10-11-2011, 07:56 PM
#10
To be honest, ill never be running a 150 shot unless im at the track. A majority of the time ill be running a 100 or maybe a 125 shot.(with the power I should make on this engine, I don't see why ill need more than a 100 shot)
Before I was turbo'd I had a stock block LS2 with a nice cam and stock heads and with a 125 shot and I cleaned up pretty well. That was making 503whp with nitrous and this engine should make more power NA. I might run a 150 just to make a good number on a dyno and maybe if im close to a 9 second pass(very close) I might up it just to get there.
Before I was turbo'd I had a stock block LS2 with a nice cam and stock heads and with a 125 shot and I cleaned up pretty well. That was making 503whp with nitrous and this engine should make more power NA. I might run a 150 just to make a good number on a dyno and maybe if im close to a 9 second pass(very close) I might up it just to get there.
I would never do anything serious on a stock LS7 block. Its the worse one ever made.
And just so you know....the strongest LSx aluminum block ever made was the first one....the 1997-1998 LS1 block.
You can easily make your 725 RWHP with an iron LQ4 and nitrous....and it will LAST a LONG time. People have made 1,000+ with boost on them. That iron block is not that much heavier overall. Or, get an aluminum block resleeved............
As mentioned....one TINY bit of detonation and you're LS7 build is history. We don't need real life experience with our own LS7, we've been around here for a long time and have read peoples pain with their LS7 failures.
.
10-11-2011, 08:20 PM
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This is my personal experience. I had a 440 ls7 with tfs 235 built by HKE and i sprayed the living hell out of it. I sprayed a 300 shot with out a problem. A good builder would tell you 150 is cake walk.
