what about boring?
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From: Mexico
what about boring? are LS-series engines reliable for boring cylinders? i've heard they are not for oversizing. if they could, what'd be the maximum oversizing you guys believe as safe to run strip/street.
It really depends on which block you are working with? Which do you have or are you considering?
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Thread Starter
TECH Apprentice
Joined: Aug 2010
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From: Mexico
LQ9/LQ4 yes
LS1 no
LM4 5.3 yes
It's not a good idea to bore a an ls1 block, with the exception of a hone/clean, b/c it's a aluminum block with iron sleeves. The other two are iron blocks, and better suited for boring. If you want to go Iron block you're better off just going LQ9 or LQ4 (easier to find).
LS1 no
LM4 5.3 yes
It's not a good idea to bore a an ls1 block, with the exception of a hone/clean, b/c it's a aluminum block with iron sleeves. The other two are iron blocks, and better suited for boring. If you want to go Iron block you're better off just going LQ9 or LQ4 (easier to find).
Thread Starter
TECH Apprentice
Joined: Aug 2010
Posts: 333
Likes: 0
From: Mexico
LQ9/LQ4 yes
LS1 no
LM4 5.3 yes
It's not a good idea to bore a an ls1 block, with the exception of a hone/clean, b/c it's a aluminum block with iron sleeves. The other two are iron blocks, and better suited for boring. If you want to go Iron block you're better off just going LQ9 or LQ4 (easier to find).
LS1 no
LM4 5.3 yes
It's not a good idea to bore a an ls1 block, with the exception of a hone/clean, b/c it's a aluminum block with iron sleeves. The other two are iron blocks, and better suited for boring. If you want to go Iron block you're better off just going LQ9 or LQ4 (easier to find).
Only heard of 3.905 bore on a 5.3 block, and even that was sonic tested. I wouldn't trust it. If he wants a 4" bore why doesn't he just find an LQ4 block? It already has a 4" bore and would probably be cheaper after all the machining.
As for my LM4 statemnt above. Meant to put LM7, LM4 is an aluminum block and is alot harder to find than an LM7. Plus I would steer away from doing anything larger than a cleanup hone on an aluminum block with stock sleeves.
As for my LM4 statemnt above. Meant to put LM7, LM4 is an aluminum block and is alot harder to find than an LM7. Plus I would steer away from doing anything larger than a cleanup hone on an aluminum block with stock sleeves.
Last edited by redz_02; Jun 15, 2011 at 04:27 PM.
Thread Starter
TECH Apprentice
Joined: Aug 2010
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From: Mexico
Only heard of 3.905 bore on a 5.3 block, and even that was sonic tested. I wouldn't trust it. If he wants a 4" bore why doesn't he just find an LQ4 block? It already has a 4" bore and would probably be cheaper after all the machining.
As for my LM4 statemnt above. Meant to put LM7, LM4 is an aluminum block and is alot harder to find than an LM7. Plus I would steer away from doing anything larger than a cleanup hone on an aluminum block with stock sleeves.
As for my LM4 statemnt above. Meant to put LM7, LM4 is an aluminum block and is alot harder to find than an LM7. Plus I would steer away from doing anything larger than a cleanup hone on an aluminum block with stock sleeves.
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A few weeks ago there was someone on here that said they had their LM7 bored to the 6.0 bore 4.007" or whatever it is and He claimed that the blocks cylinder walls were still thicker than a gen1 350's walls . He said it was sonic checked or whatever there is for checking wall thickness . I forget what he said the walls were after the material removal . Even if the cylinder walls were ok I'd be concerned about the blocks over-all strength being affected .
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I have the aluminum LS2 6.0L bored .030" over = 4.030" . its now a 418cid. and run many passes under nitrous and been in the car for five years now with no problems at all the specs are in my sig. And right now im building a new LS3 aluminum block bored .025" over = 4.090" its going to be a 431cid. when im done with it.
Thread Starter
TECH Apprentice
Joined: Aug 2010
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From: Mexico
oh, i see, that's interesting about the LM7, but i wouldn't trust that far neither, i created this thread because i heard some Ls-series engines were not good for boring, as far as now i've realized some of them can work well doing it moderately.
thanks guys
thanks guys
I have the aluminum LS2 6.0L bored .030" over = 4.030" . its now a 418cid. and run many passes under nitrous and been in the car for five years now with no problems at all the specs are in my sig. And right now im building a new LS3 aluminum block bored .025" over = 4.090" its going to be a 431cid. when im done with it.
It's nice to know your combo has worked great. I'm getting ready to send my ls2 block off to ERL to have them build one of the stock sleeve short blocks. They will bore it to 4.03" and 4.125 crank for 421. I know alot of ppl on here won't like that combo but I think it should make for a good street engine with some good mid range torque.
