Dan, the key factor is when the cylinders are uneven in compression.  No 
one
can give you a threshold reading (point where you would decide to do it),
because the compression reading depends on the atmospheric conditions and
the altitude, plus the technique used in making the test.
If all 8 cylinders are within +/- 10% of the average reading, the engine
should run fine for a long time that way.
By the way, you are posting in HTML - notice that in my reply, your pretty
colored background and all the other fancy stuff is gone from your 
posting-
that is what we have been talking about on the list for the last 10 years,
off an on.
Everyone, please, Please, PLEASE:
- trim your  posts, stay on the subject, and DON'T POST IN HTML!  It 
really
makes life tough on the people who are on digest mode - we have lost 
members
because of this problem.
I'm not an IMP cop - just another peon, but please, fix it for us all!
Thanks,
Dick Benjamin
________________________________________
From Dan
Sent: Friday, December 29, 2006 6:30 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML:Valve job
I know that Bill. I'm asking at what level is it recommended?
Thanks
Dan
----- Original Message ----- 
From: Billimp68@xxxxxxx
Sent: Friday, December 29, 2006 5:23 AM
Subject: Re: IML:Valve job
Dan,
Have a compression test done, it will tell you if you need to have the
valves worked on.
Bill/Imp, 68's
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