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Old 12-22-2012, 08:04 AM   #367
68vert's Avatar
Drives: 2010 SIM SS/RS, 1968 RS convertible
Join Date: Sep 2008
Location: Wilmington, NC
Posts: 744
Originally Posted by Inferno View Post
Are these LS7s going to explode like the ones in the Z06's from valvetrain problems???

No, GM has the issues worked out. It was always a very small amount of cars affected.

Originally Posted by Chevy Cust Svc
Hello all,

LS7 Valve guide issue summary:
Affects a small, number of '08, 09 10 and 11 Z06s
GM discovered the condition through our cylinder head warranty data involving a very small percentage of our vehicles.
Through inspection of returned heads, it was determined that a machining error in the valve guide had occurred at our head supplier.
The quality issue has been contained as of Feb 2011 with 100% inspection of all heads.
The most common customer complaint has been excessive valve train noise.
However if the condition is not addressed, it could result in engine failure. To date, where this condition has been observed, it has occurred early in the vehicle life.
What customers need to know: They should drive and enjoy their vehicles without fear. If their car demonstrates this condition, they are likely to hear unusual valvetrain noise first. If you have a concern regarding this issue on your personal vehicle feel free to contact me through private message on this forum and we will work to assist in resolving your concern. Feel free to contact me through please put attention Evan in the subject. As always, vehicles that have modifications to the powertrain or the calibrations, are no longer covered by GM's warranty.

Evan, Chevrolet Customer Service

From here :
2010 SIM SS/RS see garage for mods
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