what the maximum bore size of an LS2 block? is it the same as 346 LS1 i mean max overbore is 0.005" (3.905")?

 

I'm currently running an LS2 block bored .030" over with a 4.125" Lunati crank (421 cid). This is a dedicated road race car and gets plenty of maximum effort road race sessions. I'm also building another short block with the same over bore and a 4.100" Eagle crank (418 cid). I have had no problems with my set-up. Looking forward to the new Escalade block (4.065" standard bore size) and I plan to bore it to 4.100" (436 cid w/ 4.125" stroke).
Shirl Dickey
SD Racing Enterprises
Aguila, AZ

 

can i use with the new Escalade block standard LS1 heads, intake manifold, oil pan....etc.

 

Yes, it is an LSX based block so everything fits. The block will not be available until January as far as I know...
Shirl

 

Shirl,
From your understanding what is the bore and stroke of the L92 and--if you were to mix stock block and crank such as a ? crank and a L92 block how much displacement could you get? Is the missing link a stock 4" or 4'+ crank?
Thanks,
Bruce

 

I think you get around 415 cid with the 4.065" Escalade block and a 4.00" crank. 378 cid if you use the LS1/2/6 crank...
Shirl

 

Thanks for the info. I have a 402 and want to do an engine with the Escalade block and the new truck heads or the ls7 heads. Do the tracks in arizona have track day events in the winter months. I live in Idaho and the off season gets kind of long here. Thanks.

 

Chuck,
Yes, we have a very active winter season of track racing in AZ. We have a very enthusiastic group of corvettes that race with PASA (proautosports.com). We also have NASA and AZRA that do track events here. Please contact me if you plan to participate. We have two Corvette drivers from Oregon that keep their cars here for the winter and race with us.
I will be building an escalade block for a customer in Portland (436 cid, no sleeves) as soon as I can get my hands on one. I also have a set of LS7 heads and manifold that I will be adding to my LS2 421 road race car as soon as I can get the valves and rockers... Sounds like we have a lot in common...
Shirl Dickey

 

Thanks for the reply Shirl. I will look up the PASA site. I also have a 406. It is a solid roller with holley 950 injection in an 85 C4. I am still sorting out the chassis but the car is very fast. My email eaglemoxie@aol.com

 

i want to get LS2 block instead of the iron 6.0L block to save weight. the problem is that i have a 408 stroker kit i.e. the pistons are for 4.030" bore, is it safe to use them in an LS2 block.

any one tried the 4.030" bore in LS2 block can chime in to tell?

 

there are quite a few threads that already discuss this. at least 2 are on the 1st page alone...

one shop has apparently done it already. some others don't recommend going that far.

 

Shirl Dickey at SD racing does em .030 over. I think he is out of arizona. Check this site for 421 or 418 builds and you'll find him.

Nate

 

Isn't the sleve thickness in the LS2 the same as it was in the LS1/LS6? I haven't heard anything about GM changing the sleeve design it's just the the LS2 has no water passage between the cylinders.

The last I heard the sleeves were only .030 thick in the LS1/LS6. If that did not change with the LS2 there is no way you will be able to bore it .030 over.

 

Read post above yours. Fwiw, the ls2 sleeves measure in at about .105" and have .200" of aluminum behind that.

Nate

 

i thought i have heard a few people going .060 over on these blocks and not havein problems

if so you can fit ls7 heads on

with that think of a sleave you can get away with it i think

 

That would be great news. I am in the process of building a 402 using an SDPC short block. My LS6 block became a paper weight when a burned piston scratched it enough that 3.905 would not clean it up. It wouldn't take much more to clean it up but the walls of the sleeve are so thin that the loss of thermal efficiency would cause the water temp to rise by an estimated 30 degrees.

JE Pistons said they had never seen anyone take an LS6 past 3.905

So, does anyone know exactly how thick the sleeves in the LS2 are?

 

from what I herd they sleves were enough to go .30, but people are having a hard time figuring out how thick they are all the way down the cylinder, since the MIC doesnt diferenciate between the sleve and the alum behind it. Or at least not very well

 

Look at post #5. I already explained all this info.

Nate

 

from what you said looks like it is safe to bore the LS2 to 4.030" although GM says most you can go is 4.020".

will i have overheating problems if i go 4.030"?

 

I would like to know to, Want to build a 418cid. aluminum 6.0 - 4.030" bore , stroke 4.100" rods 6.125" going to order the block this week