Quote:
Originally Posted by J-Mech
You should not clean the valve stem with a wire wheel on a grinder. Could possibly leave a perpendicular abrasion that will cause the valve to stick. Brass brush only, by hand on the stem.
Was it acting up before you pulled the heads? 
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Looking back at my record book it was 70hrs. since I cleaned the valves and carbon not 50hrs. as I said earlier. I think if there was an abrasion on the valve stem it would show up sooner rather than later.
It did not act up before pulling the heads and has run flawlessly for 70hrs. since before starting to act up.
Thanks, Ed.