Compression Pressure
Maximum variation between cylinders is 20 lbs. for all engines.
| 302" | 130-170 | ||
| 390" (1) | 1.70-210 | ||
| 427" | 160-200 | ||
| 428" | 170-210 | ||
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VALVE TAPPET CLEARANCE
| Engine | (1) Hydraulic (Inches) | ||
|---|---|---|---|
| 302" | .067-.167 | ||
| All Others | .100-.200 | ||
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VACUUM READING
| 302" | 18" at idle |
| 390", 428" | 17" at idle |
| 427" | 15" at idle |