Butler Performance • Pontiac Tech
455 Compression Calculator
Static compression ratio & displacement for the Pontiac 455 block. Enter your build below — results update instantly.
Static Compression Ratio
11.7 : 1
Total Displacement
456 ci
Per-Cylinder Volume Breakdown
Swept volume933.2 cc
Chamber volume72.0 cc
Deck volume0.0 cc
Gasket volume8.9 cc
Piston volume+6.0 cc
Total clearance volume86.9 cc
8-cylinder Pontiac V8. This is a static (geometric) compression ratio for build planning. cc your actual heads and confirm deck height after machining. Questions on your combo? Ask a Butler Tech ›
455 Block — Cubic Inch Reference
| Bore | 4.21 | 4.25 | 4.50 |
|---|---|---|---|
| Stock 4.150 | 456 | 460 | 487 |
| +.030 4.180 | 462 | 467 | 494 |
| +.040 4.190 | 464 | 469 | 496 |
| +.060 4.210 | 469 | 473 | 501 |
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Dial in your compression with the right pistons, gaskets, and a matched rotating assembly.
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455 Compression Calculator
| Bore: (diameter) | |
| Stroke: | |
| Cylinder Head Volume: | |
| Effective Dome Volume: Butler Ross Flat Top 8cc |
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| Deck Clearance: | |
| Compressed Gasket Thickness: .040 is standard thickness | |
| Number of Cylinders: | |
| Compression Ratio : | |
| Total Displacement (in.3) : | |
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| 455 Block | Stroke | |||||
| Bore | 3.75 | 4.00 | 4.21 | 4.25 | 4.50 | |
| Stock | 4.151 | 456 | 460 | 487 | ||
| +.030 | 4.181 | 462 | 467 | 494 | ||
| +.035 | 4.186 | 464 | 468 | 495 | ||
| +.040 | 4.191 | 465 | 469 | 497 | ||
| +.060 | 4.211 | 469 | 474 | 501 | ||
| +.065 | 4.216 | 470 | 475 | 503 | ||