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Home >> Ford >> 1973 >> M-400 6.4L Eng VIN H, Not Available Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> Tune-Up - V8 >> Compression Pressure

Compression Pressure

Check compression with engine at normal operating temperature and at cranking speed, throttle valve wide open and spark plugs removed. Compression in lowest reading cylinder should be within 25% of highest reading cylinder.