Engine Compression

Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.

COMPRESSION SPECIFICATIONS

Application

Specification

Compression Ratio

4.3L

9.9:1

5.7L

10.5:1

Normal Compression Pressure

⁽¹⁾

Minimum Compression Pressure

⁽¹⁾

⁽¹⁾	Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi