[Z06] Opinion on LS7 Valve Guide Issue
03-02-2015, 09:17 AM
#1
5th Gear
Thread Starter
Member Since: Nov 2011
Location: Tomball TX
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Opinion on LS7 Valve Guide Issue
Let me first start off by saying this valve guide wear, valve dropping issue has been COMPLETELY blown out of proportion by this forum single-handedly. I've seen literally HUNDERDS of C6Zs run through the service dept at the dealership where I work. Also one of my best friends runs a local hot rod shop here in Houston where he hand ports cylinder heads and tunes cars professionally for a living.
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)
Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
03-02-2015, 10:10 AM
#2
Drifting
Let me first start off by saying this valve guide wear, valve dropping issue has been COMPLETELY blown out of proportion by this forum single-handedly. I've seen literally HUNDERDS of C6Zs run through the service dept at the dealership where I work. Also one of my best friends runs a local hot rod shop here in Houston where he hand ports cylinder heads and tunes cars professionally for a living.
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first)
Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Some owners of Corvettes equipped with the LS7 7.0L V8 engine may ask your dealership to check their vehicle for valve guide wear because of information that has been distributed on the internet, primarily at Corvette enthusiast sites. Due to these postings, some customers that have not had an issue may ask to have their vehicle checked.
How is it that me and my Father In Law took both of our Z06's into a reputable shop, his being a 2006 with 48,000 miles and mine being a 2008 with 27,000 miles and both were out of spec, I had 4 exhaust and 2 intake way out of spec, my Father In law had most of his out of spec and 2 so bad that the shop could not believe the engine had not failed yet, they opted to not restart the car.
So out of the hundreds run through your dealership, have you checked the heads on all of them, please answer this for me? If you have not checked the "hundreds of them" that does not mean a damn thing that they have run through your dealership, for what oil changes?
Last edited by AZDANZ06; 03-02-2015 at 10:13 AM.
03-02-2015, 10:30 AM
#3
Burning Brakes
Let me first start off by saying this valve guide wear, valve dropping issue has been COMPLETELY blown out of proportion by this forum single-handedly. I've seen literally HUNDERDS of C6Zs run through the service dept at the dealership where I work. Also one of my best friends runs a local hot rod shop here in Houston where he hand ports cylinder heads and tunes cars professionally for a living.
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first)
Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
BTW, what dealership do you work for?
Thanks for caring!
03-02-2015, 10:48 AM
#5
Drifting
03-02-2015, 11:01 AM
#6
Burning Brakes
BTW, David Croft works at Parkway Chevrolet in Tomball, TX, northwest of Houston. http://www.parkwaychevrolet.com/dealership/staff.htm# Any volunteers to call the dealership to discuss this?
03-02-2015, 11:02 AM
#7
Team Owner
03-02-2015, 11:11 AM
#8
Drifting
Registered for 3 years and 3 months and his first post is to bash Z06 owners. Way to make a first impression!
BTW, David Croft works at Parkway Chevrolet in Tomball, TX, northwest of Houston. http://www.parkwaychevrolet.com/dealership/staff.htm# Any volunteers to call the dealership to discuss this?
BTW, David Croft works at Parkway Chevrolet in Tomball, TX, northwest of Houston. http://www.parkwaychevrolet.com/dealership/staff.htm# Any volunteers to call the dealership to discuss this?
03-02-2015, 11:37 AM
#9
Team Owner
How is it the service side of the best dealerships for vettes in the country know all about it, and have fixed plenty yet a random dealer has never seen an issue? I know one dealer tech in Cali that personally has replaced 3 motors in Socal from dropped valves, yet if you call his service advisor/etc they claim never seen or heard of it. Most GM service people deny any sort of issue, and don't want to bad mouth the cars.
Strange that dealers can have such huge swings, with some of the top ones replacing plenty of bad heads, yet others claiming they have never seen an issue.
Strange that dealers can have such huge swings, with some of the top ones replacing plenty of bad heads, yet others claiming they have never seen an issue.
03-02-2015, 11:41 AM
#10
Team Owner
03-02-2015, 12:44 PM
#11
If, and I do mean if, this is in fact true, this is all anyone on this forum should need to know about Mr. Croft in order to assess the value of what he has already contributed, and, if we're lucky, may very well continue to contribute to this thread. I say "lucky" in all sincerity because this rather serious discussion could use some good entertainment right about now. Therefore, I for one am anxiously awaiting Mr. Croft's second exercise of his right to free speech. I'm just sorry that a Pinocchio emoticon is not available to celebrate the occasion.
03-02-2015, 01:03 PM
#12
Burning Brakes
I'm sure our boy David Croft has seen hundreds of C6Zs come through for routine oil changes and over-priced service packages. 
Obviously whatever 100-point inspection their service department pretends to conduct doesn't include an inspection of valve guides.
I at least hope his crew figured out how to change the oil correctly after hundreds of repetitions.
Obviously whatever 100-point inspection their service department pretends to conduct doesn't include an inspection of valve guides. I at least hope his crew figured out how to change the oil correctly after hundreds of repetitions.
03-02-2015, 01:07 PM
#13
Drifting
If, and I do mean if, this is in fact true, this is all anyone on this forum should need to know about Mr. Croft in order to assess the value of what he has already contributed, and, if we're lucky, may very well continue to contribute to this thread. I say "lucky" in all sincerity because this rather serious discussion could use some good entertainment right about now. Therefore, I for one am anxiously awaiting Mr. Croft's second exercise of his right to free speech. I'm just sorry that a Pinocchio emoticon is not available to celebrate the occasion.
About davidcroft
Full Name: David Croft
City: Tomball
State: TX
Country: USA
Your Zip Code: 77375
Occupation: Sellin Chevy's
Year & Model: 12 Camaro SS
Color: White
Mods: white interior panels.
Signature
'09 SS Cobalt-GM STG1 tune and O/R downpipe-traded
'12 SS Camaro-traded
'13 1LE- Headers, Pat G cam 475/460 cam only-traded
'14 SS sedan- American Racing headers & rotofab-current sled
Full Name: David Croft
City: Tomball
State: TX
Country: USA
Your Zip Code: 77375
Occupation: Sellin Chevy's
Year & Model: 12 Camaro SS
Color: White
Mods: white interior panels.
Signature
'09 SS Cobalt-GM STG1 tune and O/R downpipe-traded
'12 SS Camaro-traded
'13 1LE- Headers, Pat G cam 475/460 cam only-traded
'14 SS sedan- American Racing headers & rotofab-current sled
03-02-2015, 01:15 PM
#14
Melting Slicks
Let me first start off by saying this valve guide wear, valve dropping issue has been COMPLETELY blown out of proportion by this forum single-handedly. I've seen literally HUNDERDS of C6Zs run through the service dept at the dealership where I work. Also one of my best friends runs a local hot rod shop here in Houston where he hand ports cylinder heads and tunes cars professionally for a living.
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first)
Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
03-02-2015, 01:37 PM
#15
Burning Brakes
Let me first start off by saying this valve guide wear, valve dropping issue has been COMPLETELY blown out of proportion by this forum single-handedly. I've seen literally HUNDERDS of C6Zs run through the service dept at the dealership where I work. Also one of my best friends runs a local hot rod shop here in Houston where he hand ports cylinder heads and tunes cars professionally for a living.
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first)
Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
Most of the LS7s problems are from the sleeves cracking mainly in CYL#7 which is the last in rotation to get coolant from the front motor.
My dealership has replaced about a dozen Z06 engines in 427 drop tops(13s) due to the tolerances being too tight in the shortblock. One crate motor GM shipped us as a replacement wouldn't even crank because it was too tight.
We have NEVER seen this valve issue in person except when someone rolls up on the service drive demanding we measure their valve guide geometry....which as Tadge says is darn near impossible and highly innacurate in the car. Most of these people rolling in are out of powertrain warranty and have never had a single issue with their cars either. Usually the 2nd or 3rd owner and then immediately start saying "stealership" and Government Motors and start threatening to never buy another new GM car (which they've never bought their first
)Sorry, but that's just how I see it.
Also we as GM consumers are lucky that GM and their engineers interact with us as much as they do on the forums. I personally find it interesting to chat with them at car events and online. Some of you in this thread are trying to ruin that for the rest of us.
flamesuit on
http://www.corvetteblogger.com/2013/...ette-stingray/
Can you explain to the CF membership how Tomball is servicing Hundreds of C6 Z06s when it probably never even sold a hundred of these cars in the 8 years of production?
Thanks for caring.
Last edited by Bad_AX; 03-02-2015 at 02:01 PM.
03-02-2015, 01:43 PM
#16
Drifting
OK Mr. Croft of Parkway Chevrolet in Tomball, TX, I'm not ready to move on from your statements just yet. Doing some envelope math with the knowledge that there are "over 3000 +" U.S. Chevrolet dealerships and knowing that total production of the C6 Z06 is 30,548 vehicles including the 2013 427 Convertible, if Parkway Chevrolet in Tomball, TX sold an "average" number of C6 Z06 models for all dealerships that would put Tomball's sales at about 10 Z06s total for the 8 years of production. But maybe Tomball is one of the 900 dealers accounting for 80% of Corvette sales. If Tomball is one of those special high selling Corvette dealers that would boost total C6 Z06 sales at your dealership to about 34 cars. TOTAL! Looking at the dealership from Google Earth, it doesn't look like a huge business. Maybe 350 cars in total, new, used, trucks and all. From Google street view, it definitely doesn't look like one of the large volume Corvette specialist.
http://www.corvetteblogger.com/2013/...ette-stingray/
Can you explain to the CF membership how Tomball is servicing Hundreds of C6 Z06s when it probably never even sold a hundred of these cars in the 8 years of production?
Thank for caring.
http://www.corvetteblogger.com/2013/...ette-stingray/
Can you explain to the CF membership how Tomball is servicing Hundreds of C6 Z06s when it probably never even sold a hundred of these cars in the 8 years of production?
Thank for caring.
03-02-2015, 01:48 PM
#18
Melting Slicks
I need to get mine done soon. 2006 with 49K miles. Have had it since 20K miles. Still runs strong. Have till 68K miles for my 3rd party warranty to run out (bumper to bumper). That or 20 more months. Whichever comes first. Already had to replace my AC system, fuel tank sending unit and passenger side window regulator. I bet they are going to be pissed when they see my heads are out of spec.
03-02-2015, 01:48 PM
#19
Drifting
Their service department has some horrible reviews:
http://www.yelp.com/biz/parkway-chevrolet-tomball
https://www.google.com/search?q=Park...9c5736def202,1
http://www.yelp.com/biz/parkway-chevrolet-tomball
https://www.google.com/search?q=Park...9c5736def202,1
Last edited by AZDANZ06; 03-02-2015 at 01:50 PM.
03-02-2015, 01:51 PM
#20
Le Mans Master
OK Mr. Croft of Parkway Chevrolet in Tomball, TX, I'm not ready to move on from your statements just yet. Doing some envelope math with the knowledge that there are "over 3000 +" U.S. Chevrolet dealerships and knowing that total production of the C6 Z06 is 30,548 vehicles including the 2013 427 Convertible, if Parkway Chevrolet in Tomball, TX sold an "average" number of C6 Z06 models for all dealerships that would put Tomball's sales at about 10 Z06s total for the 8 years of production. But maybe Tomball is one of the 900 dealers accounting for 80% of Corvette sales. If Tomball is one of those special high selling Corvette dealers that would boost total C6 Z06 sales at your dealership to about 34 cars. TOTAL! Looking at the dealership from Google Earth, it doesn't look like a huge business. Maybe 350 cars in total, new, used, trucks and all. From Google street view, it definitely doesn't look like one of the large volume Corvette specialist.
http://www.corvetteblogger.com/2013/...ette-stingray/
Can you explain to the CF membership how Tomball is servicing Hundreds of C6 Z06s when it probably never even sold a hundred of these cars in the 8 years of production?
Thank for caring.
http://www.corvetteblogger.com/2013/...ette-stingray/
Can you explain to the CF membership how Tomball is servicing Hundreds of C6 Z06s when it probably never even sold a hundred of these cars in the 8 years of production?
Thank for caring.