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Home >> GMC >> 1972 >> G25/G2500 Van Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> Tune-Up - V8 >> Compression Pressure

Compression Pressure

With air cleaner removed and choke and throttle wide open, crank engine through at least four compression strokes. Compression should be 150 psi with a maximum variation of 20 psi between cylinders.