[Z06] Another LS7 valve job
10-22-2013, 11:40 PM
#1
Racer
Thread Starter
Another LS7 valve job
2007 ZO6 27xxx I had my valves checked and found out major valve guide clearance Bamg I had a valve job all better with bronze guides new ferrea superalloy hollow Inconel exhaust valve
Last edited by zuli; 10-23-2013 at 06:52 PM.
10-22-2013, 11:48 PM
#2
10-23-2013, 04:01 AM
#4
This has become an all too common story... I think any Z with over 20k miles needs to be checked. I usually hate the legal BS, but frankly this sounds like worthy grounds for a class action suit considering how many stock engines are having this problem, especially with such low mileage.
10-23-2013, 08:55 AM
#5
Melting Slicks
10-23-2013, 11:14 AM
#7
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Good thing you had the engine checked - would hate to read about another LS7 engine being destroyed.
10-23-2013, 12:02 PM
#8
Le Mans Master
Where the heads replaced also? Remember you can't have wear without friction and if everything is lined up that goes away. Changing materials with the same poor alignment gained you nothing.
10-23-2013, 12:54 PM
#9
Burning Brakes
10-23-2013, 03:24 PM
#10
Melting Slicks
This has become an all too common story... I think any Z with over 20k miles needs to be checked. I usually hate the legal BS, but frankly this sounds like worthy grounds for a class action suit considering how many stock engines are having this problem, especially with such low mileage.
10-23-2013, 05:57 PM
#13
I didn't say I knew this particular engine was stock, but I said that many stock LS7's have exhibited this problem. I've examined 3 in the past month myself. When you see multiple street cars with different mfg dates (talking years here), with as low as 20k suffering from this problem, and many are stock, there's an issue.
This is lousy engineering and/or poor manufacturing. I design products for a living and am familiar with many forms of testing required for durability & reliability, along with overall DFM requirements and GM didn't do their proper homework. I've worked with clients that will demand proper testing and allow the time for it, including an unforeseen major "reset" that delays production if required to deliver the "right" product. Other clients want to hit a launch date & will deal with the fallout later. It seems fair to say we're dealing with the latter here.
This is lousy engineering and/or poor manufacturing. I design products for a living and am familiar with many forms of testing required for durability & reliability, along with overall DFM requirements and GM didn't do their proper homework. I've worked with clients that will demand proper testing and allow the time for it, including an unforeseen major "reset" that delays production if required to deliver the "right" product. Other clients want to hit a launch date & will deal with the fallout later. It seems fair to say we're dealing with the latter here.
10-23-2013, 06:00 PM
#14
Racer
Thread Starter
I used old heads with new bronze guides and new exhaust valves also changed rocker arm to trunion style
10-23-2013, 06:00 PM
#15
Le Mans Master
I didn't say I knew this particular engine was stock, but I said that many stock LS7's have exhibited this problem. I've examined 3 in the past month myself. When you see multiple street cars with different mfg dates (talking years here), with as low as 20k suffering from this problem, and many are stock, there's an issue.
This is lousy engineering and/or poor manufacturing. I design products for a living and am familiar with many forms of testing required for durability & reliability, along with overall DFM requirements and GM didn't do their proper homework. I've worked with clients that will demand proper testing and allow the time for it, including an unforeseen major "reset" that delays production if required to deliver the "right" product. Other clients want to hit a launch date & will deal with the fallout later. It seems fair to say we're dealing with the latter here.
This is lousy engineering and/or poor manufacturing. I design products for a living and am familiar with many forms of testing required for durability & reliability, along with overall DFM requirements and GM didn't do their proper homework. I've worked with clients that will demand proper testing and allow the time for it, including an unforeseen major "reset" that delays production if required to deliver the "right" product. Other clients want to hit a launch date & will deal with the fallout later. It seems fair to say we're dealing with the latter here.
10-23-2013, 06:03 PM
#16
Racer
Thread Starter
Hey "zuli", Just wondering what the Chevy dealer charges to do the wiggle test or did you have it done by an independent shop. I'm in the south bay area, Torrance. The two dealers I've spoken to in the area(Long Beach & Cerrito's) say that there not familiar with this "LS7" valve problem that we've been seeing.
10-23-2013, 06:03 PM
#17
Le Mans Master
10-23-2013, 06:50 PM
#20
Team Owner
