[Z06] Sending my car to Katech for heads / cam
03-25-2014, 10:49 PM
#43
Cruising
Member Since: May 2005
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
They are doing their standard Katech Stage II build, went with the K501 cam. I will be running the Akrapovic full ti system that has been on the car for a couple years. Good luck on your build, looking forward to the results.
03-26-2014, 02:49 PM
#44
Premium Supporting Vendor
Valve guide clearance measurements on this job:
03-26-2014, 08:17 PM
#45
Pro
Thread Starter
03-27-2014, 08:10 AM
#47
Premium Supporting Vendor
Also, some of the worst offenders were intake valves which supports our statement that it's the seat-to-guide concentricity and not a specific problem with the OEM exhaust valve.
03-27-2014, 08:27 AM
#48
Melting Slicks
03-27-2014, 10:51 AM
#51
Burning Brakes
In time, given the use bronze guides and S.S. valves, no doubt they would also fail if the interface was not concentric, might take a little longer, but fail they would
I believe we can also conclude that re-worked OEM heads, that have sustained lot's of mileage and/or track time without guide wear, have addressed the machining problem that GM's vendor is responsible for.
03-27-2014, 10:59 AM
#52
Premium Supporting Vendor
We are seeing more and more real data that supports your satatement that the primary culprit is the lack of concentricity between valve seat and guide.
In time, given the use bronze guides and S.S. valves, no doubt they would also fail if the interface was not concentric, might take a little longer, but fail they would
I believe we can also conclude that re-worked OEM heads, that have sustained lot's of mileage and/or track time without guide wear, have addressed the machining problem that GM's vendor is responsible for.
In time, given the use bronze guides and S.S. valves, no doubt they would also fail if the interface was not concentric, might take a little longer, but fail they would
I believe we can also conclude that re-worked OEM heads, that have sustained lot's of mileage and/or track time without guide wear, have addressed the machining problem that GM's vendor is responsible for.
03-27-2014, 11:23 AM
#53
Melting Slicks
04-19-2014, 10:06 AM
#55
Pro
Thread Starter
Car is still at katech. After I found that the lifters and cam had some scaring on them at only 5 track days and 9000 miles, I decided to add a full ARE system to the build. Looks like I was pushing the car harder than I thought on cup tires. 
Car should be ready by end Of April.
Car should be ready by end Of April.
04-19-2014, 10:18 AM
#56
Car is still at katech. After I found that the lifters and cam had some scaring on them at only 5 track days and 9000 miles, I decided to add a full ARE system to the build. Looks like I was pushing the car harder than I thought on cup tires. Car should be ready by end Of April.
Car should be ready by end Of April.
04-19-2014, 12:57 PM
#59
Pro
Thread Starter
04-19-2014, 01:50 PM
#60
Drifting
Member Since: Feb 2012
Location: CHARLOTTE NC
Posts: 1,503
Likes: 0
Received 0 Likes
on
0 Posts
Sorry to hear about the cam and lifter scaring found during your build. Better now than later. the ARE system will take care of that issue. Cup tires most certainly caused your Gs to increase bigtime. Cant wait to see the results next month. Hope to see you at track attack 