[Z06] LS7 block repairable?
02-08-2010, 01:26 PM
#22
Safety Car
07-05-2010, 05:30 PM
#23
Pro
Valves for lunch
Same problem here. Blown LS7 ate the bottom end of the exhaust valve. Most likely will go the Darton route. It would be just wrong to put an iron block in a ZO6. The Darton sleeve gives you a stronger block than the original. The block wasn't the problem anyway. Has anyone actually had a block fail? Highly recommend SS valves. All parts must be tested before the go back. Good luck
07-05-2010, 06:10 PM
#24
Former Vendor
I some cases seen it does really ask the question, What came first the piston or the valve. My experience with cast pistons pushed too hard is the piston failed first. The exhaust valve is something that is along for the ride. Hard to say really, it's kinda funny how little of exhaust valve problems are reported with forged pistons....
Randy
Last edited by Randy@DRM; 07-05-2010 at 10:35 PM.
07-05-2010, 08:14 PM
#26
Racer
Member Since: Aug 2004
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Had one that looked just like that last October. It blew #1 not #7. All stock. Ran great until it blew without warning.
07-06-2010, 11:27 AM
#27
Steve,
I'm going to send you an email with more info but we have a couple different options to repairing and sleeving your LS7 where it will be stronger than ever before. If the cast iron liner is the only thing that is cracked then we can sleeve it using our Dry Sleeve system. If part of the outer aluminum cylinder is cracked as well then we can repair it and sleeve it using our Superdeck 1 sleeving system.
I'm going to send you an email with more info but we have a couple different options to repairing and sleeving your LS7 where it will be stronger than ever before. If the cast iron liner is the only thing that is cracked then we can sleeve it using our Dry Sleeve system. If part of the outer aluminum cylinder is cracked as well then we can repair it and sleeve it using our Superdeck 1 sleeving system.
07-06-2010, 03:55 PM
#28
Drifting
I have been watching the problems with hole number 7 for years. Fuel, Air, water and steam. It's not all fuel related but that doesn't help anything.
I some cases seen it does really ask the question, What came first the piston or the valve. My experience with cast pistons pushed too hard is the piston failed first. The exhaust valve is something that is along for the ride. Hard to say really, it's kinda funny how little of exhaust valve problems are reported with forged pistons....
Randy
I some cases seen it does really ask the question, What came first the piston or the valve. My experience with cast pistons pushed too hard is the piston failed first. The exhaust valve is something that is along for the ride. Hard to say really, it's kinda funny how little of exhaust valve problems are reported with forged pistons....
Randy
Just an FYI for the record, I had a forged mahle piston when my solid steele exhaust valve ate it up.
07-06-2010, 04:01 PM
#29
Former Vendor
07-06-2010, 07:17 PM
#30
Drifting
07-06-2010, 08:41 PM
#31
Premium Supporting Vendor
I bought a complete engine from a 2007 that was "junk"
Did the same thing, dropped a valve, ate up a cylinder.
There was some welding involved to repair the water jacket before I put two sleeves in it. It was repairable, it has been fixed and is already a running engine again.
Obviously the machine shop should look at it and decide, but the two sleeves were not that expensive. Darton made two of them for us that were the same as the stock sleeves. Took a week or so.
Needless to say I had nothing in a good running LS7.
I would be very sure you let someone who knows what they are doing look at the block before you junk it. I did not read all of the comments here but I would guess that most of the people telling you it is a boat anchor have neither fixed one nor ever even built an engine...
Did the same thing, dropped a valve, ate up a cylinder.
There was some welding involved to repair the water jacket before I put two sleeves in it. It was repairable, it has been fixed and is already a running engine again.
Obviously the machine shop should look at it and decide, but the two sleeves were not that expensive. Darton made two of them for us that were the same as the stock sleeves. Took a week or so.
Needless to say I had nothing in a good running LS7.
I would be very sure you let someone who knows what they are doing look at the block before you junk it. I did not read all of the comments here but I would guess that most of the people telling you it is a boat anchor have neither fixed one nor ever even built an engine...
07-06-2010, 09:28 PM
#32
Intermediate
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Location: VA
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If you decide to scrap your block let me know. Name your price and I'll take it off your hands. Sorry for your misfortune. 
Last edited by Perdition; 07-06-2010 at 09:31 PM.
07-06-2010, 10:23 PM
#34
Drifting
No idea! I was in 4th doing about 150ish & planning to shift close 7krpm but it let go before I could shift (maybe at 6700rpm). It was similar to the way my 1st motor went. I just shift into 3rd gear when all of a sudden, I see a big puff of white smoke in my rear view mirror. Then it's all she wrote!
