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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Denis, if you want to be a quick expert on the subject, you could put a dial-indicator on a rocker of a hot engine, (Don't burn yourself.) measure the gap, then let it cool, re-measure the gap. --Most dial-indicators have resolution to half a thou (.000 5) inch. ...so maybe if the hot CHT is ~280F you can measure a thou difference when it cools to 100F. ...See if the Close Enough /Probably Okay/ Engineering numbers from cp deliver as expected.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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