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Home >> GMC >> 1982 >> Forward Control 4.8L Eng VIN T, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up - 6 CYL >> Engine Compression

Engine Compression

When making compression checks, disconnect ignition switch Pink wire from High Energy Ignition system. With air cleaner removed and throttle and choke wide open, crank engine through at least four compression strokes.

COMPRESSION SPECIFICATIONS

Compression Ratio
  4-1L 8.3:1
  4.8L 8.0:1
Compression Pressure 130 psi (9.1 kg/cm2 )
Maximum Pressure Variation
  Between Cylinders 30 psi (2.1 kg/cm2 )