LS2 block can be bored to...?
Thread Starter
Joined: Nov 2005
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From: NYC
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?
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; Jun 17, 2013 at 07:06 PM.
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.
Thread Starter
Joined: Nov 2005
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From: NYC
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.
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; Jun 17, 2013 at 10:06 PM.
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Verdad Gallardo 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.
Thread Starter
Joined: Nov 2005
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From: NYC
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.
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.
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.
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.
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.
K1 4.1" is # 346-4100RB6F
The 4.1" crank is compatible on all the 4.125" stroke pistons per the Wiseco catalog.
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Joined: Sep 2023
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From: Australia
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.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
413 ls1 gen 3 can't take a 4.100 crank
Last edited by phrozin; Sep 7, 2023 at 09:32 PM.
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Predator z hasn't been here for over EIGHT YEARS. Check post dates.....
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From: Australia
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