boring LS2 block to 4.030", safe?
11-17-2005, 04:51 AM
#2
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
Shirl Dickey
SD Racing Enterprises
Aguila, AZ
11-17-2005, 12:25 PM
#5
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
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
Last edited by See5; 11-17-2005 at 12:32 PM.
11-17-2005, 08:29 PM
#7
Originally Posted by MrEracer
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
Shirl
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11-17-2005, 08:49 PM
#8
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
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
11-18-2005, 08:03 PM
#9
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
11-28-2005, 06:40 AM
#10
boring LS2 block to 4.030", safe? 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?
any one tried the 4.030" bore in LS2 block can chime in to tell?
11-28-2005, 08:25 AM
#11
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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.
one shop has apparently done it already. some others don't recommend going that far.
11-29-2005, 01:34 PM
#13
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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.
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.
11-29-2005, 02:37 PM
#14
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Originally Posted by LeMansBlue04
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.
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.
Nate
11-29-2005, 02:57 PM
#15
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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
if so you can fit ls7 heads on
with that think of a sleave you can get away with it i think
11-29-2005, 03:57 PM
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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?
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?
11-29-2005, 06:41 PM
#17
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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
11-29-2005, 07:00 PM
#18
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Originally Posted by LeMansBlue04
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?
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?
Nate
11-29-2005, 08:08 PM
#19
Originally Posted by Nate_Taufer
Read post above yours. Fwiw, the ls2 sleeves measure in at about .105" and have .200" of aluminum behind that.
Nate
Nate
will i have overheating problems if i go 4.030"?
