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Old 10-21-2008, 02:46 PM   #2
Scooby Newbie
Member#: 115744
Join Date: May 2006
Chapter/Region: MAIC
Location: Chesapeake,VA

reason they may not be able to help is the fact of compression readings will be different having to do with the altitude you are at and also cam timing will change that reading,
for instance as on my 12.1 motor advancing and retarding cam timing let the compression range from 180 to 240 and that was in a range of only 7 degrees of change.kind of a hard number for a company to pin down
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