Butler Performance • Pontiac Tech
326 Compression Calculator
Static compression ratio & displacement for the Pontiac 326 block. Enter your build below — results update instantly.
Static Compression Ratio
8.8 : 1
Total Displacement
326 ci
Per-Cylinder Volume Breakdown
Swept volume667.5 cc
Chamber volume72.0 cc
Deck volume0.0 cc
Gasket volume7.1 cc
Piston volume+6.0 cc
Total clearance volume85.1 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 ›
326 Block — Cubic Inch Reference
| Bore | 3.75 | 4.00 | 4.21 |
|---|---|---|---|
| Stock 3.719 | 326 | 348 | 366 |
| +.030 3.749 | 331 | 353 | 372 |
| +.040 3.759 | 333 | 355 | 374 |
| +.060 3.779 | 336 | 359 | 378 |
Ready To Build?
Dial in your compression with the right pistons, gaskets, and a matched rotating assembly.
Shop Pistons
Shop Head Gaskets
326 Rotating Assemblies
326 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) : | ||
|
|
| 326 Block | Stroke | |||||
| Bore | 3.75 | 4.00 | 4.21 | 4.25 | 4.50 | |
| Stock | 3.720 | 326 | 348 | 370 | ||
| +.030 | 3.750 | 331 | 353 | 376 | ||
| +.040 | 3.760 | 333 | 355 | 378 | ||
| +.060 | 3.780 | 337 | 359 | 382 | ||