K 30 1 Ton Pickup 4WD V8-454 7.4L VIN W 4-bbl (1983)
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.