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Home >> GMC >> 1987 >> Suburban 1/2 Ton 2WD V8-454 7.4L >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Compression Check >> Specifications
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Compression Check: Specifications

Minimum, 698 kPa (100 psi) @ 200 rpm.
The lowest cylinder reading should not be less than 80% of the highest. Perform compression test with engine at normal operating temperature, spark plugs removed and throttle wide open.