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[Z06] Exhaust Valves 1 & 7 the ones to wiggle test?

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Old 01-21-2014, 09:16 AM
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valet_devil
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Default Exhaust Valves 1 & 7 the ones to wiggle test?
It seems many people will only have two valves checked for a wiggle test. I reviewed the Master Guide Clearance Thread (http://forums.corvetteforum.com/c6-z...ster-list.html)

and it looks like (with exception, of course) that the bottom measurements of the #1 and #7 exhaust valves tend to be the worse off. If I do the test, these will be the ones I check first.

Did anyone see anything strongly different?
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Old 01-21-2014, 09:35 AM
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My #7 exhaust valve was the only one of mine that was in spec.
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Old 01-21-2014, 09:45 AM
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Mark2009
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Well, that pretty much says it all....

If you're going to check them, start wherever you want but check them all (intakes too).
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Old 01-21-2014, 10:59 AM
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Originally Posted by ctsv510
My #7 exhaust valve was the only one of mine that was in spec.
Like I said, anything can vary but just looking at the lists seemed like these two generally gave a better look than most. Checking all is best, but if someone (a dealer, wiggle test vendor, you, etc.) will only check two, then maybe these would be best.

How was your #1 compared to others?
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Old 01-21-2014, 11:18 AM
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Originally Posted by ctsv510
These measurements were done with the heads off the car using a dial indicator gauge at 3/4-1" above the guide with the valve just off its seat.

Cylinder - Intake - Exhaust

1- .010 - .009
2- .010 - .010
3- .010 - .009
4- .009 - .008
5- .010 - .011
6- .008 - .008
7- .007 - .006
8- .010 - .008

Based on the calculation from wiggle test measurements to actual clearances (/2):

1- .0050 - .0045
2- .0050 - .0050
3- .0050 - .0045
4- .0045 - .0040
5- .0050 - .0055
6- .0040 - .0040
7- .0035 - .0030
8- .0050 - .0040
Here you go
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Old 01-21-2014, 11:41 AM
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LawrenceFromTorrance
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I think #5 must be checked. On mine it was 4-6 and 3-5
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Old 01-21-2014, 12:58 PM
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Vette @ 71
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Originally Posted by ctsv510
Here you go
Are you still getting the actual measurements for comparison..
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Old 01-21-2014, 01:19 PM
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My effort on this thread is to find the most commonly (on average) worst off valves so as to help others quickly check. I'm inviting anyone to point out patterns they see amongst the data on this forum, not for anecdotal "well my personal motor was different so there isn't a pattern." Some cylinders get hotter than others, so maybe they would be the better ones to check first.
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Old 01-21-2014, 01:24 PM
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ctsv510
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Originally Posted by Vette @ 71
Are you still getting the actual measurements for comparison..
Hopefully, that's the plan. I was going to call later this week to get a status update and see where they're at with everything.
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Old 01-21-2014, 06:27 PM
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Dirty Howie
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Originally Posted by ctsv510
Hopefully, that's the plan. I was going to call later this week to get a status update and see where they're at with everything.
If I wasn't prepping my car for a saturday track day I would have swung by Richard's and got some photos for you ....

I'm sure he is going to give you your actual measurements. Looking forward to your results


DH
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Old 01-21-2014, 06:47 PM
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You can stop checking if you find one out of spec. I doubt you will have to check them all.
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