Thread: Compression test on my new lightning motor...help??
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Old 06-24-2009, 08:18 PM
CobraKit CobraKit is offline
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Join Date: Sep 2003
Location: Southern Maryland
Vehicle: 2003 Ford F150
Posts: 455
Manual did not call out. Said 75 percent diffrence allowed between high and low. Add oil on low to see if it makes a diffrence. If it does rings, if not valves. Chart showed max pressure from 134 to 250 and low to 101.
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