400 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) : | |
400 Block Cu In Chart
| 400 Block | Stroke | |||||
| Bore | 3.75 | 4.00 | 4.21 | 4.25 | 4.50 | |
| Stock | 4.120 | 400 | 427 | 449 | 453 | 480 |
| +.030 | 4.150 | 406 | 433 | 456 | 460 | 487 |
| +.035 | 4.155 | 407 | 434 | 457 | 461 | 488 |
| +.040 | 4.160 | 408 | 435 | 458 | 462 | 489 |
| +.060 | 4.180 | 412 | 439 | 462 | 467 | 494 |
| +.065 | 4.185 | 413 | 440 | 463 | 468 | 495 |
1975-76 400 557 Casting numbers- When upgrading to a stroker kit in the 400 block, blocks with Casting Numbers ending in 557*** we recommend limiting to 4.000" Stroke and less than 500hp due to thinner main webbing. These can tend to break under higher stress from the larger stroke.
Early 1967 400's may have deep 389-421 style chamfer in the cylinder. If the cylinder chamfer is deeper than .250 you may need a piston that has a top ring groove that has been lowered to keep from exposing the top ring when the piston is as top dead center. We have designed a piston specifically for this block with lower oil rings and an oil rail support.
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