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  #29 (permalink)  
Old 06-28-2003, 07:08 PM
craigayl's Avatar
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Join Date: Nov 2001
Location: Canton, MI, MI
Cobra Make, Engine: Superformance Cobra SC, 514CID
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Is there any reason to think you may have a bent valve stem or a broken valve spring (that is if you have dual or triple springs)? Maybe a bad roller rocker? Your compression test is done at cranking speed. At running sppeds you may have a valve that is not closing fast enough to build proper combustion pressure.

This is not too long of a shot. I've seen it happen.
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