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 |