6.2 liter LS valve problems??

[g356gear]

My sister has a 2007 Escalade Ext with the 400hp 6.2 LS motor. Last Friday the truck did a heavy shimmy shake and stopped dead on the hwy. Long story short, the dealer pulled the valve cover and discovered the engine had swallowed a valve into the motor. Dealer said this is a common problem with the 6.2 and that they will do a full longblock crate motor exchange. Apparently these motors have a "hardened" valve that has been breaking from being too hard to the point of being brittle. Truck has 53000 miles. Has anyone seen or heard of this problem? Dealer said it is a common and they don't even bother to repair the motors anymore, they just change them out.

[andrew5]

yep that's the right story.i run a chevy service dept.we used to replace the heads,but gm came out with a bullitin to replace the engine.

[70rs]

Is this the factory stock L92 heads that are failing?

[youthpastor]

please ship old motor to...... Tacoma Washington:D - I'll fix it!

seriously- thats how we roll in at the used car market too. quicker and cheaper to replace complete engines than mess around with gaskets and machine labor

[z4me69]

it's verry common i have fixed 5 or 6 of em

[jy211]

good to know this stuff as I have a new crate one of these sitting in my 55' chassis. :D

[70rs]

it's verry common i have fixed 5 or 6 of em

Is this the L92 engines that are having the problems? Is it specific to any year or model it was installed in?

[Mkelcy]

So far as I've heard, it's an L92 issue, not an LS3 issue. Here's the only thing I could find on a quick Google search: http://forum.grrrr8.net/showthread.php?p=177239

Note that Denali's came with L92 engines, not LS3s.

[70rs]

So far as I've heard, it's an L92 issue, not an LS3 issue. Here's the only thing I could find on a quick Google search: http://forum.grrrr8.net/showthread.php?p=177239

Note that Denali's came with L92 engines, not LS3s.

Thanks Mike. That will give me some information to go with, and search for more. I am going to use L92 heads and want to be sure I don't miss something important like valves breaking off. :wow:

[andrew5]

http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2274537&from=sm

[Mkelcy]

Thanks Mike. That will give me some information to go with, and search for more. I am going to use L92 heads and want to be sure I don't miss something important like valves breaking off. :wow:

I should have noted that I'm a relieved owner of an LS3. :D

[70rs]

I should have noted that I'm a relieved owner of an LS3. :D

:lol: yeah, I bet you are relieved.

[70rs]

http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2274537&from=sm

That said i am not authorized to view the information. Inside GM bulletin.

[andrew5]

opps sorry it's the 6.0 and 6.2 litre truck motors 2007 only

[70rs]

opps sorry it's the 6.0 and 6.2 litre truck motors 2007 only

Ok, great. Thanks for making that clear. Now I know what to look out for.
:thumbsup:

[BritishGreen68]

I bough an L92 take out that had about 12K on it and it had broken valves. The head of the intake valve was missing completely from the engine i got, and the valve stem was bent and it cracked the valve guide. The top of the piston wasnt too happy either...