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LS2 block can be bored to...?

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Old 06-17-2013, 06:08 PM
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It appears that a few of you who've been playing with blocks are in here so I'll ask this here:

The LS3/L92 block has a "max stroke" (as per the GMPP catalog) of 4 inches.

The LSA & LS9 blocks have a max stroke of 4.5 inches.

It's my understanding that the LSA & LS9 blocks are a LS3 block with piston squirters and steel main caps. Additionally, the LS9 are also deck plate honed. Are the sleeves also different?

Last edited by Paul Bell; 06-17-2013 at 07:06 PM.
Old 06-17-2013, 08:19 PM
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LSA/9 blocks are also more expensive than LS7 blocks.
Old 06-17-2013, 08:42 PM
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LSA and LS9 will not be able to support a 4.5" stroke. Someone fed you some BS.
Old 06-17-2013, 08:51 PM
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From the GMPP catalog:
Old 06-17-2013, 09:15 PM
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That's still incorrect. Probably a typo.
Old 06-17-2013, 09:19 PM
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OK, that's a possibility.

Can you tell us the sleeve length differences between the LS3 & LS7 blocks?
Old 06-17-2013, 09:31 PM
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The sleeves on the LS7 protrude down below the aluminum bore of the block and they're scalloped. The LSA/LS9 sleeves are not like this, they're basically the same as the other aluminum blocks and are much shorter.
Old 06-17-2013, 09:57 PM
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Gotcha, thanks for the info. Interesting how the GMPP catalog made that typo in the 2011 and 2012 issues.

There are a good number of vendors offering 4.125 inch stroke engines in the LS3 block so I'm thinking it must be "safe" to do so. TSP, Katech, SLP, and others all offer LS3 based engines with 4.125 stroke cranks.

Last edited by Paul Bell; 06-17-2013 at 10:06 PM.
Old 06-18-2013, 01:06 AM
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Like I said, the 4.100" combo is popular because of the pistons with thinner crowns. Wiseco has a line for 4.100" that I think you can get in their K1 setup. With an LS3, that's a 427.
Old 06-18-2013, 07:08 AM
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Hey Jake, I did see your post above about that. I'm a N/A guy so crown thickness is less of a concern.

I have the Wiseco/K1 catalog, their LS engine strokes are 4.00, 4.125 and 4.25 inches. They don't list a 4.10.

It looks like I'm gonna go with a LS3 block bored to 4.07 with a stroke of 4.125.
Old 06-18-2013, 07:12 AM
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I made a math error in post 20 (it's corrected now). The rod ratio for a 6.125 rod at 4.125 stroke is 1.48.
Old 06-18-2013, 07:29 AM
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On my 3rd year running my LS2 at 4.030,doesnt use any oil.
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Old 06-18-2013, 10:45 AM
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Originally Posted by Paul Bell
Gotcha, thanks for the info. Interesting how the GMPP catalog made that typo in the 2011 and 2012 issues.

There are a good number of vendors offering 4.125 inch stroke engines in the LS3 block so I'm thinking it must be "safe" to do so. TSP, Katech, SLP, and others all offer LS3 based engines with 4.125 stroke cranks.

This is a photo I took of an LSA I built for the last TX Mile. It's a stock stroke crank with forged rods and pistons. You can see how the sleeve is shorter than the bore in the block. The LS7 sleeves protrude down further past the aluminum.



You can also see how the oil squirters don't clear the piston. I bent the squirters away from the pistons, but then they would hit the connecting rod of the opposing cylinder, and that was with the stock stroke.
Old 06-18-2013, 02:01 PM
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Great pic!
Old 06-18-2013, 02:12 PM
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http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf

K1 4.1" is # 346-4100RB6F
The 4.1" crank is compatible on all the 4.125" stroke pistons per the Wiseco catalog.
Old 09-07-2023, 09:18 PM
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Originally Posted by PREDATOR-Z
Yes, see when increasing stroke you bring the piston further down in the cylinder which exposes the bottom of the piston out of sleeve further at BDC. This action allows the piston to rock more and eventually can lead to an increase in oil blow by consumption.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
gen4 blocks have longer sleeves for that very reason 6.0-6.2 can take a 4.100 crank I've got a 4.100 stroke 4.00 bore I'm running Manely 6.125 h-beam rods and JE 1.065 CH flat top GEN4 LS 6.0 block and rec port heads
413 ls1 gen 3 can't take a 4.100 crank

Last edited by phrozin; 09-07-2023 at 09:32 PM.
Old 09-08-2023, 12:14 AM
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Originally Posted by phrozin
gen4 blocks have longer sleeves for that very reason 6.0-6.2 can take a 4.100 crank I've got a 4.100 stroke 4.00 bore I'm running Manely 6.125 h-beam rods and JE 1.065 CH flat top GEN4 LS 6.0 block and rec port heads
413 ls1 gen 3 can't take a 4.100 crank
Predator z hasn't been here for over EIGHT YEARS. Check post dates.....
Old 09-08-2023, 10:01 PM
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Originally Posted by G Atsma
Predator z hasn't been here for over EIGHT YEARS. Check post dates.....
I tried to delete the post but couldnt, but the info is their for anyone hitting the thread thinking the same, I didn't quote you so why are you posting when it was clearly none of you business
Old 09-08-2023, 10:39 PM
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Originally Posted by phrozin
I tried to delete the post but couldnt, but the info is their for anyone hitting the thread thinking the same, I didn't quote you so why are you posting when it was clearly none of you business
lighten up Francis
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Old 09-08-2023, 11:21 PM
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Originally Posted by phrozin
I tried to delete the post but couldnt, but the info is their for anyone hitting the thread thinking the same, I didn't quote you so why are you posting when it was clearly none of you business
To delete a post of yours, look in the lower right corner where there will be an "edit" button. Push it and go from there. There will be 2 delete buttons to push.


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