[Z06] Appears GM HAS FIXED LS7 Valve Issue with '12-'13 LS7s
10-05-2013, 12:17 AM
#41
Le Mans Master
1 year of ownership and 3,000 miles on my 427 - no funny noises. I know it's early, but I'll wait till I hear of a '12 or '13 reported with a problem before I give up on my LS7.
(Although, with respect for '07-'11 owners, I'm certainly not vouching for GM's customer service policies.)
(Although, with respect for '07-'11 owners, I'm certainly not vouching for GM's customer service policies.)
10-05-2013, 07:49 AM
#42
Pro
1 year of ownership and 3,000 miles on my 427 - no funny noises. I know it's early, but I'll wait till I hear of a '12 or '13 reported with a problem before I give up on my LS7.
(Although, with respect for '07-'11 owners, I'm certainly not vouching for GM's customer service policies.)
(Although, with respect for '07-'11 owners, I'm certainly not vouching for GM's customer service policies.)
10-05-2013, 08:36 AM
#43
Lifetime NCM Member #2497
I am trailering my 2012 into the dealership this morning. It has 10,589 miles on it. The car started to tick real bad, then threw a low oil code and then shut down all in about 20 seconds. It had a horrible smell. I will let you all know when I hear something back.
500 Mi. No problems yet! Just wish I had the courage to push the start button, gonna tow it in & wiggle test it 
10-05-2013, 09:15 AM
#45
10-05-2013, 09:32 AM
#46
A 427 vert that dropped a valve? I don't know how I missed that one.
I do recall a 427 vert owner who had some engine issues, and needed a replacement engine, but I don't recall it being a dropped valve.
I do recall that he had a good deal of concern about the fact that the car would not have the original engine in it.
I do recall a 427 vert owner who had some engine issues, and needed a replacement engine, but I don't recall it being a dropped valve.
I do recall that he had a good deal of concern about the fact that the car would not have the original engine in it.
10-05-2013, 11:07 AM
#47
Le Mans Master
I have a 2013 Z06 with a Build date of 01/2013. Engine was also assembled in 01/2013. No miles to speak of yet. Only 1000. A friend of mine has a 427 convertible with near 6000 miles. He drives the car way more than I do mine. No noise whatsoever comes from either engine bay. May hear an injector pulse but as far as valve noise, not there. Oil usage, not there.
10-05-2013, 11:50 AM
#48
Le Mans Master
2012 Z06 here ordered early and took Del Aug 26 2011 car has 22,000 mile no oil use or track time. No loud ticking from it so maybe gonna make it have ext GMPP till 2018 and 95000 miles so we shall see.
z51vett
Doug
z51vett
Doug
10-05-2013, 12:32 PM
#49
Pro
10-05-2013, 02:37 PM
#50
Racer
My 2013 Z has 8,000 miles on it. The only noise so far sounds like lifter bleed off. If the car sets for several days, there is a slight lifter noise for about 20 seconds when started. It gets quieter as it idles, until it goes away after the 20 seconds or so. Once gone, the noise is gone until it sets for several days again ? I will notify Chevrolet at next oil change just so they have it on record ??
10-05-2013, 10:49 PM
#51
Race Director
A 427 vert that dropped a valve? I don't know how I missed that one.
I do recall a 427 vert owner who had some engine issues, and needed a replacement engine, but I don't recall it being a dropped valve.
I do recall that he had a good deal of concern about the fact that the car would not have the original engine in it.
I do recall a 427 vert owner who had some engine issues, and needed a replacement engine, but I don't recall it being a dropped valve.
I do recall that he had a good deal of concern about the fact that the car would not have the original engine in it.
not sure if that owner's engine problem was ever completely disclosed in that now-deleted thread...
I just recall the general discussion.
10-05-2013, 10:57 PM
#52
Team Owner
10-05-2013, 11:01 PM
#53
Team Owner
My 2013 Z has 8,000 miles on it. The only noise so far sounds like lifter bleed off. If the car sets for several days, there is a slight lifter noise for about 20 seconds when started. It gets quieter as it idles, until it goes away after the 20 seconds or so. Once gone, the noise is gone until it sets for several days again ? I will notify Chevrolet at next oil change just so they have it on record ??
My previous motor would start up quietly and then after left idling for several minutes it would get louder ......... it finally blew up which solved that noise
DH
10-06-2013, 06:18 AM
#54
Pro
I prefer to remain neutral due to the fact that I myself have no hard evidence to support there is a flaw in design. From what I am reading and have seen, this may never be agreed upon as to the origin of cause. Casting blame never solves anything. "I believe" it is from improper machining of guides. Not an Engineering issue. This is to say a quality control issue or misunderstanding as to the machining process for PM guides. My last statement may be somewhat misleading. I have provided corrections due to unforeseen variables to Design engineers. With data, it is well received. Their first question is “How can we avoid further reoccurrence”? However, more than that, I've had to come into a room full of Master Mechanics and say, "This unit is failing due to improper installation or improper handling”. Sometimes, it's a misunderstanding of procedure. Sometimes it seems you need to hold some by the hand. Many times we search for a "Smoking gun". Most times it's not that easy or complex. In this case, a lot of concerns have been expressed. Geometry, Guide compatibility, Rocker ratio, Heat transfer, Sodium filled valves, improper machining of guides, etc. When no one answer stands out, ask which one would most likely cause "all the above"? Lastly, as an example, rolling element bearings should last for many years by design. However 80 percent will never meet or exceed their design life due to outside influences beyond engineering controls. It's all about precision.
10-06-2013, 08:38 AM
#55
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I'm not sure why so many people think GM would have fixed this problem that they first tried denying, lied and said it only affected certain years, and then went out of their way to sometimes try to deny warranty work on supposedly stock vehicles. Fool me once shame on you fool me twice, well you know where this is going.
Stop with the sky if falling crap because it already fell. Not necessarily with the motor completely but with how GM handles the issue. The reason to not fix the motor is so they can double dip and try so sell someone a new engine who is out of warranty or either try to be unscrupulous deny warranty coverage then turn around and say oh but by the way we can sell ya a replacement motor for 15k. If it worked/worked on 1 out of 10 people they accomplished their goal. There are so many loyalists out there as you can read from some of the above posts that they have no need to fix it. Change is only made from banning products and taking a stand. What's worse than all of the dropped valve threads is all the people backing GM and trying to say the sky isn't falling. Why would greedy GM spend money making a change if they know the loyalists are out there who couldn't care less about their less than satisfactory quality control. I get it though, some of the loyalists aren't loyalists at all and are just concerned with resale value down the line however standing up and demanding change would have helped it even more so because there would be healthy motors out there now and could have restored some people's faith in GM.
Sorry for the rant but as you see a 2013 427 vert already crashed and burned do to us not standing up and showing GM we weren't standing for their bull. Bullies only bully until you punch them in the mouth.
10-06-2013, 11:28 AM
#56
Le Mans Master
10-06-2013, 11:56 AM
#57
