389 Compression Calculator
| Bore: (diameter) | ||
| Stroke: | ||
| Cylinder Head Volume: | ||
| Effective Dome Volume:Butler Ross Flat Top -8cc | ||
| Deck Clearance: | ||
| Compressed Gasket Thickness: .040 is standard thickness | ||
| Number of Cylinders: | ||
| Compression Ratio : | ||
| Total Displacement (in.3) : | ||
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| 389 Block | Stroke | |||||
| Bore | 3.75 | 4.00 | 4.21 | 4.25 | 4.50 | |
| Stock | 4.062 | 389 | 415 | 441 | 467 | |
| +.030 | 4.092 | 395 | 421 | 447 | 473 | |
| +.040 | 4.102 | 396 | 423 | 449 | 476 | |
| +.060 | 4.122 | 400 | 427 | 454 | 480 | |