[Z06] GM response to LS7 valve guide issue summary confirmed
01-03-2013, 10:47 PM
#1503
Team Owner
Getting closer to being a member of the SS Valve Club.
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure.
These heads are from an 06 with only 16K miles on them.
DH
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure.
These heads are from an 06 with only 16K miles on them.DH
01-03-2013, 10:51 PM
#1504
Race Director
Getting closer to being a member of the SS Valve Club.
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure. These heads are from an 06 with only 16K miles on them.
DH
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure.
These heads are from an 06 with only 16K miles on them.DH
DH, I don't know whether Richard will charge extra, but it would be good to know what the guide clearances are when the rebuild 06 head is finished, and good data for the next rebuild two years down the road.
01-04-2013, 10:36 AM
#1506
Melting Slicks
Getting closer to being a member of the SS Valve Club.
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure. These heads are from an 06 with only 16K miles on them.
DH
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure.
These heads are from an 06 with only 16K miles on them.DH
Nice. My warranty is up in April. Not 100% on my direction but the heads are on the list for sure. I am not sold on the SS so ill probably go with the titanium.
01-04-2013, 12:42 PM
#1509
Burning Brakes
01-04-2013, 12:59 PM
#1510
01-04-2013, 02:20 PM
#1512
You might want to do a little more reading up.
Not every set of heads that they get are found to be out of spec.
Date of heads pulled: 6/1/12
Head Type: GM LS7
Year: 2006
Miles: 18,000 (cam and mods done around 5,000)
Track time: None (90 1/4 passes)
Tune: Yes
Mods: Was a Katech stage 1 car (full exhaust, torquer 110 cam, halltec intake supporting mods etc) done at ~5,000 miles; was 531 rwhp then
Guys, just a thought. If you want this to be informative and helpful rather than the train wreck previous threads, keep your opinions about warranties and other things irrelevant to facts and data to a minimum. If you don't have data to assist here, don't feel the need to just fill the air...
All of mine were in spec from my understanding.
Head Type: GM LS7
Year: 2006
Miles: 18,000 (cam and mods done around 5,000)
Track time: None (90 1/4 passes)
Tune: Yes
Mods: Was a Katech stage 1 car (full exhaust, torquer 110 cam, halltec intake supporting mods etc) done at ~5,000 miles; was 531 rwhp then
Guys, just a thought. If you want this to be informative and helpful rather than the train wreck previous threads, keep your opinions about warranties and other things irrelevant to facts and data to a minimum. If you don't have data to assist here, don't feel the need to just fill the air...
All of mine were in spec from my understanding.
Getting closer to being a member of the SS Valve Club.
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure. These heads are from an 06 with only 16K miles on them.
DH
Heads should be done next Friday. If so I will go down and pick them up. I will take some pictures of my heads and of the WCCH facilities.
My core heads had some intake guides in spec but some exhaust guides over .015, beyond what Richard can measure.
These heads are from an 06 with only 16K miles on them.DH
So are you saying that at 16K miles, the exhaust stem to guide clearance was so bad that it was off the scale?
What is the farthest Richard can measure?
I forgot whose heads you bought.
Last edited by '06 Quicksilver Z06; 06-18-2014 at 08:38 AM.
01-04-2013, 03:08 PM
#1514
http://forums.corvetteforum.com/c6-z...ls7-heads.html
Confused Garage had 18K miles on his.
These are my original heads measured locally in Western Pennsylvania, and with about 21K miles on them.
WCCH is hardly the only ones seeing excessive guide wear in these cars.
Last edited by '06 Quicksilver Z06; 01-04-2013 at 03:12 PM.
01-04-2013, 03:17 PM
#1515
Team Owner
He told me the outside measurement parameter but I forgot what he said.
Heads are from Joe in Arizona, forgot his handle. (Sure you can find it
). He said he would post up on the threads when I got the info. But no cam or track time or oil usage if I remember correctly.DH
01-04-2013, 03:21 PM
#1516
Team Owner
He told me that the only thing consistant about the guide wear is that it is inconsistant.
If you implying that he is intentionally stating wear that isnt there I can tell you he had no motivation to do that. We already discussed and agreed on the work I was having done regardless of the guide wear.
And he told me again I should be good for 100K with my track duty considered.
DH
If you implying that he is intentionally stating wear that isnt there I can tell you he had no motivation to do that. We already discussed and agreed on the work I was having done regardless of the guide wear.
And he told me again I should be good for 100K with my track duty considered.
DH
01-04-2013, 03:29 PM
#1517
Yes, at 16K 2 of the exhausts were off the scale. Most of the intakes were good.
He told me the outside measurement parameter but I forgot what he said.
Heads are from Joe in Arizona, forgot his handle. (Sure you can find it). He said he would post up on the threads when I got the info. But no cam or track time or oil usage if I remember correctly.
DH
He told me the outside measurement parameter but I forgot what he said.
Heads are from Joe in Arizona, forgot his handle. (Sure you can find it
). He said he would post up on the threads when I got the info. But no cam or track time or oil usage if I remember correctly.DH
He told me that the only thing consistant about the guide wear is that it is inconsistant.
If you implying that he is intentionally stating wear that isnt there I can tell you he had no motivation to do that. We already discussed and agreed on the work I was having done regardless of the guide wear.
And he told me again I should be good for 100K with my track duty considered.
DH
If you implying that he is intentionally stating wear that isnt there I can tell you he had no motivation to do that. We already discussed and agreed on the work I was having done regardless of the guide wear.
And he told me again I should be good for 100K with my track duty considered.
DH
Other vendors, including Katech themselves, have stated that they have observed excessive guide wear in these cylinder heads.
BTW, here is another one, just in today, every guide worn, and it wasn't Richard who found them. It was a local machine shop.
http://forums.corvetteforum.com/c6-z...post1582735814
Last edited by '06 Quicksilver Z06; 01-04-2013 at 04:24 PM.
01-04-2013, 03:44 PM
#1518
Team Owner
Yes, yes, I remember now. He had headers, CAI, and tune. None of which should have worn out his guides.
That's what it looked like to me, and I recall someone else attempting to imply that he was making up the numbers.
Other vendors, including Katech themselves, have stated that they have observed excessive guide wear in these cylinder heads.
That's what it looked like to me, and I recall someone else attempting to imply that he was making up the numbers.
Other vendors, including Katech themselves, have stated that they have observed excessive guide wear in these cylinder heads.
Hopefully next friday I will pick them up.
Still haven't decided on the install date. 
DH
01-04-2013, 03:52 PM
#1519
In my case he was only really concerned with the condition of the heads. He said he checked the bolt holes and some other aspects of the head and told me they were in great shape. The guide wear was just an incidental finding that he wanted me to know.
Hopefully next friday I will pick them up. Still haven't decided on the install date.
DH
Hopefully next friday I will pick them up.
Still haven't decided on the install date. DH
01-04-2013, 04:48 PM
#1520
Team Owner
