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Home >> Chevrolet >> 1971 >> P30 Van 4.8L Eng VIN S >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Tune-Up - 6 CYL >> Compression Pressure

Compression Pressure

With air cleaner removed and throttle and choke wide open, crank engine through at least four compression strokes. Compression should be 130 psi with a maximum variation of 20 psi between cylinders.