[Z06] GM response to LS7 valve guide issue summary confirmed
09-06-2012, 08:18 PM
#201
Safety Car
Anyone remember that 1999 Ford Cobra fiasco where Ford was pretty much forced to admit that those cars weren't making the power advertised.
That was a public relations NIGHTMARE for Ford and team Mustang and SVT. And it damaged the value of those cars beyond any fix supplied by Ford.
This would be at least that bad and probably worse. A whole lot worse, especially with 427 convertibles rolling off the trucks.
That was a public relations NIGHTMARE for Ford and team Mustang and SVT. And it damaged the value of those cars beyond any fix supplied by Ford.
This would be at least that bad and probably worse. A whole lot worse, especially with 427 convertibles rolling off the trucks.
09-06-2012, 09:25 PM
#202
Burning Brakes
Those cars were never anything special to begin with (99 Cobra) in the big scheme of things; meaning they never had the hype or purpose built intent, as the Z06. So it's not really an apples to apples comparison. Just my opinion.
Also like Joe stated, its not just the Z06's we own, my loyalty lies in my driveway with my New Tahoe, Pickup truck and LS1 Trans Am. Also the 10 previous GM products. I have been considering buying at CTS-V coupe this fall, but I've put that on hold.
09-06-2012, 09:39 PM
#204
Burning Brakes
09-06-2012, 09:43 PM
#205
Bone stock.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
Last edited by '06 Quicksilver Z06; 09-06-2012 at 10:13 PM.
09-06-2012, 10:45 PM
#207
Melting Slicks
Bone stock.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
09-06-2012, 10:46 PM
#208
Melting Slicks
09-06-2012, 10:57 PM
#209
Burning Brakes
Hey Quick, dumb question, but which side of the guide, in relation to the valve is the top and which is the bottom? Seems that most of the valve guide wear sheets I've seen show most of the wear at the bottom of the guide.
Last edited by TORQJNKY; 09-07-2012 at 11:59 AM.
09-06-2012, 11:06 PM
#210
Racer
Member Since: Dec 2007
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)That being said, i will be inspecting my valve guide wear at the end of this season (20k on this setup) to see if the problem has been fixed. If it is a geometry problem (rocker platform location/angle) obviously the work that was performed will not mitigate the issue. If the guides show to be in good shape i will not be 100% confident that the problem was thermal or geometry, but i will be more confident that the solid stem will provide more longevity fatigue wise. After seeing the valve without a head on it and showing a good sealing pattern on the guide entry zone i will say i am happy to have a solid stem in my car. I was totally torn on this matter, i was literally to the point where i wanted to flip a coin. The thermal characteristic of the sodium filled valves are in deed more efficient but the thought of having a weld joint spooked me too much. i will be sure to post my findings on the revamped setup.
09-07-2012, 04:14 AM
#211
Instructor
Member Since: Jul 2012
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09-07-2012, 05:29 AM
#212
Team Owner
Their competitors, Porsche, Ford, Mercedes, Dodge, BMW, would descend upon them like vultures, and have a field day with this matter were they to do that.
Automobile companies are reluctant to admit blunders even when they cost human lives. It is doubtful that GM is going to admit one here affecting a small percentage out of 27,000 cars.
They don't care about "customer loyalty" amongst Z06 owners. They don't care about pissing off Z06 owners. Why do you think they built the grand sport?
Automobile companies are reluctant to admit blunders even when they cost human lives. It is doubtful that GM is going to admit one here affecting a small percentage out of 27,000 cars.
They don't care about "customer loyalty" amongst Z06 owners. They don't care about pissing off Z06 owners. Why do you think they built the grand sport?
Lets take the 2006 Z-06 used if ketp in the same condition it has bottomed out. Like they were cheaper 1-2 years ago. The real low mile ones have moved up in price. Sure they made 6200 in 2006 but people wreaked and rodded and drove alot of them.
It's the GS! and base car! with so many more made they are helping hold the value of the Z06 up!
09-07-2012, 08:56 AM
#213
Le Mans Master
Member Since: Jan 2009
Location: Pottsboro; Sometimes Dallas Texas
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St. Jude Donor '12
Their competitors, Porsche, Ford, Mercedes, Dodge, BMW, would descend upon them like vultures, and have a field day with this matter were they to do that.
Automobile companies are reluctant to admit blunders even when they cost human lives. It is doubtful that GM is going to admit one here affecting a small percentage out of 27,000 cars.
They don't care about "customer loyalty" amongst Z06 owners. They don't care about pissing off Z06 owners. Why do you think they built the grand sport?
Automobile companies are reluctant to admit blunders even when they cost human lives. It is doubtful that GM is going to admit one here affecting a small percentage out of 27,000 cars.
They don't care about "customer loyalty" amongst Z06 owners. They don't care about pissing off Z06 owners. Why do you think they built the grand sport?
Any weakness shown, their competitors will take advantage.But, they should care what Z06 owners (and 427 Vert owners-after all, which engine is sitting in their car) think, because we also buy those Tahoes, Yukons (have one), Escalades, Malibu's, CTS's....etc....
They BETTER care....all I have to say or I WILL drop their azz's like a hot potatoe. And I have been one of their "new" car/truck/SUV customers my entire life.
See this GM...
09-07-2012, 09:43 AM
#214
Melting Slicks
Bone stock.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
Every one of the exhaust valve guides is out of spec. #1 exhaust valve guide is way out of spec.
I posted this up immediately after getting it back so I have not even looked at it on the paper, but it looks like 2 of the intake guides were gone too, and the rest of them were on the brink if the service limit is .0037".
The heads currently on my car will be coming off next week. They are sold already. Hopefully the gentleman I sold them to will get a sheet indicating how much valve guide wear is on those 20K mile heads on my car.
.
Ouch! What year Z06 did the heads come off of?
09-07-2012, 11:22 AM
#216
Le Mans Master
My car is PARKED as of yesterday and will not be driven until I can derive a course of action from whatever statement is waiting to be made by GM.
But regardless, my heads will be coming off the car sir, I will guarantee you that. But I will not pull them until I have a replacement in my hands to keep from having an open motor exposed to the climate during the wet winter months here in Charleston.
I may pull my heads to find out; WOW, I'm okay afterall OR I may quite easily find "WOW, I was on borrowed time!" I have a sneaking suspicion it will be the latter because this summer I have noticed what "I think" is some real valve noise between 1,500-2,500 RPM. Past 2,500 I cannot hear the motor over the exhaust because the butterflies start opening up.
If they are indeed fine, I will sell them to help recoup the new set of whatever I purchase (may be GMPP LSX LS7 heads if the problem did in fact, NOT follow over to them).
I mean NO disrespect, that is not my intent and I understand what you are trying to do; but when I read your post that I multi-quoted, it just seemed that your statement was trying to minimalize what was transpiring. I just think many, many of us are a bit on edge right now.
Respectfully,
Jeff
But regardless, my heads will be coming off the car sir, I will guarantee you that. But I will not pull them until I have a replacement in my hands to keep from having an open motor exposed to the climate during the wet winter months here in Charleston.
I may pull my heads to find out; WOW, I'm okay afterall OR I may quite easily find "WOW, I was on borrowed time!" I have a sneaking suspicion it will be the latter because this summer I have noticed what "I think" is some real valve noise between 1,500-2,500 RPM. Past 2,500 I cannot hear the motor over the exhaust because the butterflies start opening up.
If they are indeed fine, I will sell them to help recoup the new set of whatever I purchase (may be GMPP LSX LS7 heads if the problem did in fact, NOT follow over to them).
I mean NO disrespect, that is not my intent and I understand what you are trying to do; but when I read your post that I multi-quoted, it just seemed that your statement was trying to minimalize what was transpiring. I just think many, many of us are a bit on edge right now.
Respectfully,
Jeff
09-07-2012, 11:26 AM
#217
Le Mans Master
Thread Starter
FYI:
The idea of this sticky was to be informational but it turned into a town hall meeting. Nature of forums I guess.
GM will be posting info giving customers a specific method to address any concerns or issues. Once this process is set up, an announcement will be made, hopefully within the next few weeks, but possibly sooner.
Hang in there...
I will add this to the original post.
Mike
The idea of this sticky was to be informational but it turned into a town hall meeting. Nature of forums I guess.
GM will be posting info giving customers a specific method to address any concerns or issues. Once this process is set up, an announcement will be made, hopefully within the next few weeks, but possibly sooner.
Hang in there...
I will add this to the original post.
Mike
09-07-2012, 11:38 AM
#218
Burning Brakes
09-07-2012, 11:45 AM
#219
Melting Slicks
09-07-2012, 11:49 AM
#220
Le Mans Master
Member Since: Jan 2009
Location: Pottsboro; Sometimes Dallas Texas
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St. Jude Donor '12
FYI:
The idea of this sticky was to be informational but it turned into a town hall meeting. Nature of forums I guess.
GM will be posting info giving customers a specific method to address any concerns or issues. Once this process is set up, an announcement will be made, hopefully within the next few weeks, but possibly sooner.
Hang in there...
I will add this to the original post.
Mike
The idea of this sticky was to be informational but it turned into a town hall meeting. Nature of forums I guess.
GM will be posting info giving customers a specific method to address any concerns or issues. Once this process is set up, an announcement will be made, hopefully within the next few weeks, but possibly sooner.
Hang in there...
I will add this to the original post.
Mike
)
