Engine Compression
Before making a compression test or cranking engine with a remote starting switch, disconnect ignition switch connector (Pink wire) from HEI system distributor. Test compression with engine warm, all spark plugs removed and throttle and choke valves wide open. Crank engine through at least 4 compression strokes.
ENGINE COMPRESSION
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| 260" | 8.0-1 | ||
| 301" | 8.2-1 | ||
| 305" | 8.4-1 | ||
| 350" (VIN E, H, J & M) | 7.6-1 | ||
| 350" (VIN L) | 8.2-1 | ||
| 350" (VIN P) | 7.6-1 | ||
| 350" (VIN R) | 8.3-1 | ||
| 350" (VIN X) | 8.0-1 | ||
| 400"(VIN Z) | |||
| Standard | 7.7-1 | ||
| High Performance (1977-79 Only) | 8.1-1 | ||
| 403" (VIN K) | |||
| 1975-77 | 7.6-1 | ||
| 1977 | 8.5-1 | ||
| 1978 | 7.9-1 | ||
| 1979 | 8.3-1 | ||
| Recommended Fuel | Unleaded (87 AKI Minimum) | ||
| Compression Pressure (All) | 120-160 psi | ||
| Max. Variation Between Cylinders | 30% | ||