[Z06] 2009 Z06, stock, 7500 miles. Guide wear measurements
11-25-2014, 05:15 PM
#61
valve seat concentricity , valve guide to valve stem clearance issues , all from poor machine work @ the supplier , even new factory replacement cyl heads have been known to have issues .
11-25-2014, 06:54 PM
#62
Burning Brakes
How much is the inspection/wiggle test and how much is the fix, if needed?
Phil tuned my current ls3 c6 and I am not too far from you. I am test driving a zo6 shortly, if the weather holds up. I would like to get a ball park in case I do end up pulling the trigger.
11-25-2014, 10:34 PM
#63
Safety Car
11-26-2014, 08:16 AM
#65
Premium Supporting Vendor
Thread Starter
Since most production level machining nowadays is performed on computer controlled machines that indicates there might be a maintenance issue with a machine or an issue with the control program for the machine/machines. They could conceivably have two programs one that is correct and one that is incorrect with the same P/N applied to each. Since not all heads have the problem it looks like there is some sort of QC problem with the machines or the control programming. GM said the problem was resolved on their end by doing a complete incoming inspection on heads delivered after Feb. 2011. It would be interesting to see how the results vary in heads that were delivered to GM after that time.
Bill
Bill
Valve seat to guide concentricity.
11-26-2014, 08:22 AM
#66
Premium Supporting Vendor
Thread Starter
Hey Jason,
How much is the inspection/wiggle test and how much is the fix, if needed?
Phil tuned my current ls3 c6 and I am not too far from you. I am test driving a zo6 shortly, if the weather holds up. I would like to get a ball park in case I do end up pulling the trigger.
How much is the inspection/wiggle test and how much is the fix, if needed?
Phil tuned my current ls3 c6 and I am not too far from you. I am test driving a zo6 shortly, if the weather holds up. I would like to get a ball park in case I do end up pulling the trigger.
If you're local and looking for a Z06 I have an 06 with a brand new GM engine priced to sell.
https://www.corvetteforum.com/forums...by-katech.html
11-26-2014, 01:52 PM
#68
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11-26-2014, 02:00 PM
#69
Instructor
All true, and honestly I still would like a z, but a $75,000 car with a $15,000 engine shouldn't need any fix for any amount just to keep going. 550 -600 hp on a z!!! Now im really jealous!
11-26-2014, 02:03 PM
#70
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11-29-2014, 01:45 PM
#71
Melting Slicks
Issue: "Valve seat to guide concentricity"
I don't disagree, but then we should see poor leak down tests as well as poor performance on new engines because the valves are not seating correctly.
I don't disagree, but then we should see poor leak down tests as well as poor performance on new engines because the valves are not seating correctly.