LS7 may need a sleeve
#1
Teching In
Thread Starter
LS7 may need a sleeve
I have an LS7 in a 2006 z06 with what I would say is minor damage in cylinder #2.
Dropped an intake valve because I forgot to put lash caps back on after reinstalling the heads 😔.
There are 2 dings in the sleeve, no cracks. Probably too deep to overbore. But I'm wondering if possible to sleeve. Motor is otherwise fine.
Local machine shop says sleeving an LS7 always cracks...
Anyone with better news?
Dropped an intake valve because I forgot to put lash caps back on after reinstalling the heads 😔.
There are 2 dings in the sleeve, no cracks. Probably too deep to overbore. But I'm wondering if possible to sleeve. Motor is otherwise fine.
Local machine shop says sleeving an LS7 always cracks...
Anyone with better news?
#2
TECH Addict
iTrader: (1)
I have an LS7 in a 2006 z06 with what I would say is minor damage in cylinder #2.
Dropped an intake valve because I forgot to put lash caps back on after reinstalling the heads 😔.
There are 2 dings in the sleeve, no cracks. Probably too deep to overbore. But I'm wondering if possible to sleeve. Motor is otherwise fine.
Local machine shop says sleeving an LS7 always cracks...
Anyone with better news?
Dropped an intake valve because I forgot to put lash caps back on after reinstalling the heads 😔.
There are 2 dings in the sleeve, no cracks. Probably too deep to overbore. But I'm wondering if possible to sleeve. Motor is otherwise fine.
Local machine shop says sleeving an LS7 always cracks...
Anyone with better news?
#3
TECH Addict
iTrader: (1)
BTW, until you know exactly why that valve dropped, it may not be your fault. Yes, that's a big error, especially if you put many miles on it without them. If you did, then it is probably on you. HOWEVER, if it did this within, oh, say only 25-50 miles, then it may not be on you. It may be just the LS7 being an LS7!! Counting on an LS7 having a reliable valvetrain is like counting on honesty and reliability in an ex wifes testimony at a custody hearing! Yes, I like that metaphor......
The following 2 users liked this post by grinder11:
dixiebandit69 (06-22-2024), G Atsma (06-10-2024)
#4
TECH Senior Member
LS7 with block issues?? Nawwww.....
(Sorry, could not resist...)
(Sorry, could not resist...)
#5
LS1TECH Sponsor
iTrader: (1)
Chances are the block is cracked behind the dented areas in the sleeve. Most likely can't be fixed. Unless you are local to me, not worth the cost of shipping it to find out. I've been replacing these cracked LS7 blocks with sleeved LC9 5.3 blocks. Much stronger casting.
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
The following 5 users liked this post by Steve - Race Eng:
Che70velle (06-11-2024), G Atsma (06-11-2024), gnx7 (06-22-2024), LaBLKv6Z (06-11-2024), NAVYBLUE210 (06-11-2024)
The following users liked this post:
G Atsma (06-11-2024)
#7
Teching In
Thread Starter
Chances are the block is cracked behind the dented areas in the sleeve. Most likely can't be fixed. Unless you are local to me, not worth the cost of shipping it to find out. I've been replacing these cracked LS7 blocks with sleeved LC9 5.3 blocks. Much stronger casting.
Got the sleeve out and of course you were right cracked behind the sleeve. A good local shop did it. They recommended loctite and darton single sleeve to fix it.
I'm trying to keep the original motor because it is a low mile car but if it's just lost cause give it to me straight. I'm in Newport News Virginia.
Trending Topics
#8
Teching In
Thread Starter
Chances are the block is cracked behind the dented areas in the sleeve. Most likely can't be fixed. Unless you are local to me, not worth the cost of shipping it to find out. I've been replacing these cracked LS7 blocks with sleeved LC9 5.3 blocks. Much stronger casting.
#9
TECH Addict
iTrader: (1)
I know you want to hear it will be OK if it passes a pressure test, but I'd listen to @Steve - Race Eng . He has forgotten more about this stuff than most guys will ever know. I would imagine there is a very small chance it would be OK. But unless you have really deep pockets, or just enjoy pulling the engine (some guys do, depending on their age), I'd give up on it. It may be OK for a year, or??? But with all the heat cycles, the flexing of the casting, etc., I dont see it being long term reliable. But, I've been wrong before......
#10
LS1TECH Sponsor
iTrader: (1)
That will leak with just Loctite. I don't think it can be successfully welded. When you weld that up it will most likely crack elsewhere in that bore on cool down or crack when the sleeve is installed. These blocks appear to get brittle with age. What I could weld up and repair a few years ago is no longer possible. Best to start with another casting. Any LS2, LS3 block can be sleeved also the already mentioned LC9 5.3 aluminum truck block.
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
The following users liked this post:
C6Z06Adam (06-22-2024)
#11
Teching In
Thread Starter
That will leak with just Loctite. I don't think it can be successfully welded. When you weld that up it will most likely crack elsewhere in that bore on cool down or crack when the sleeve is installed. These blocks appear to get brittle with age. What I could weld up and repair a few years ago is no longer possible. Best to start with another casting. Any LS2, LS3 block can be sleeved also the already mentioned LC9 5.3 aluminum truck block.