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Engine Compression

Test compression with all spark plugs removed and engine at normal operating temperature. Crank engine through at least 5 compression strokes and record highest reading. Maximum variation between cylinders is 25 percent.

COMPRESSION RATIO SPECIFICATIONS

Application	Compression Ratio
5.0L MPFI	9.0:1
5.8L MPFI	8.3:1
7.5L MPFI	8.0:1