Yes turn the kill switch to off to disable the ignition circuit. Yes remove all of the spark plugs. All cylinders should be within 10% of each other. Compression numbers around 125 psi is an indication of a worn engine, lower numbers are a sign it’s time to consider repowering.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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