"Help! I bored and stroked my engine and now I don't know what size it is!"
How to calulate your engine size using the bore and stroke:
Use the calculator below, or you can calculate your engine size by taking the square of the bore divided by 4, multiplied by pi, multiplied by the stroke, multiplied by the number of cylinders:
((Bore X Bore) / 4) X pi X Stroke X Cylinders
For example, a Chrysler 426 (Hemi or Wedge) has a standard bore of 4.25" and a standard stoke of 3.75". Plugging that into the above formula gives us:
((4.25 X 4.25) / 4) X 3.141592654 X 3.75 X 8 = 425.59, or 426 cubic inches.
If you were to bore your 426 sixty over (0.060"), simply add 0.060" to the 4.25" bore:
((4.31 X 4.31) / 4) X 3.141592654 X 3.75 X 8 = 437.69, or 438 cubic inches.
Now if you were to install a 5/8ths stroker crank to your bored 426, you can add 5/8" (0.625") to the stroke in the same formula:
((4.31 X 4.31) / 4) X 3.141592654 X 4.375 X 8 = 510.64, or 510 cubic inches.
(This works the same for cubic inches or cubic centimeters -- if you use centimeters for the bore and stroke, the result will be in cubic centimeters. Divide CCs by 1,000 to get litres. Divide cubic inches by 61.023 to get litres. You can input centimeters in the calculator below, but the litres listed in the output will be wrong, since the calculator assumes input in inches.)
Use this calculator to figure out your engine size in cubic inches. You can add bore and/or stroke if you want. It will also convert to litres for you.
| Description | Bore | Stroke | # of Cylinders | Cubic Inches | Litres |
| 170 Slant Six | 3.40625 | 3.125 | 6 | 170.86 | 2.8 |
| 198 Slant Six | 3.40625 | 3.64 | 6 | 199.02 | 3.3 |
| 225 Slant Six | 3.40625 | 4.125 | 6 | 225.54 | 3.7 |
| 301 Chrysler Hemi | 3.625 | 3.625 | 8 | 299.30 | 4.9 |
| 331 Chrysler Hemi | 3.8125 | 3.625 | 8 | 331.06 | 5.4 |
| 354 Chrysler Hemi | 3.9375 | 3.625 | 8 | 353.13 | 5.8 |
| 392 Chrysler Hemi | 4.00 | 3.90625 | 8 | 392.70 | 6.4 |
| 241 Dodge Hemi | 3.4375 | 3.25 | 8 | 241.30 | 4.0 |
| 259 Dodge Hemi | 3.5625 | 3.25 | 8 | 259.16 | 4.2 |
| 270 Dodge Hemi | 3.625 | 3.25 | 8 | 268.34 | 4.4 |
| 315 Dodge Hemi | 3.625 | 3.8125 | 8 | 314.78 | 5.2 |
| 325 Dodge Hemi | 3.6875 | 3.796875 | 8 | 324.39 | 5.3 |
| 276 DeSoto Hemi | 3.625 | 3.34375 | 8 | 276.08 | 4.5 |
| 291 DeSoto Hemi | 3.71875 | 3.34375 | 8 | 290.54 | 4.8 |
| 330 DeSoto Hemi | 3.71875 | 3.796875 | 8 | 329.91 | 5.4 |
| 341 DeSoto Hemi | 3.71875 | 3.796875 | 8 | 329.91 | 5.4 |
| 345 DeSoto Hemi | 3.8 | 3.8 | 8 | 344.77 | 5.6 |
| 277 A Poly | 3.75 | 3.125 | 8 | 276.12 | 4.5 |
| 301 A Poly | 3.90625 | 3.125 | 8 | 299.61 | 4.9 |
| 303 A Poly | 3.8125 | 3.3125 | 8 | 302.52 | 5.0 |
| 313 A Poly | 3.875 | 3.3125 | 8 | 312.52 | 5.1 |
| 315 A Poly | 3.90625 | 3.3125 | 8 | 317.58 | 5.2 |
| 318 Poly | 3.90625 | 3.3125 | 8 | 317.58 | 5.2 |
| 326 A Poly | 3.953125 | 3.3125 | 8 | 325.25 | 5.3 |
| 273 LA | 3.625 | 3.3125 | 8 | 273.50 | 4.5 |
| 318 LA | 3.90625 | 3.3125 | 8 | 317.58 | 5.2 |
| 340 LA | 4.04 | 3.3125 | 8 | 339.70 | 5.6 |
| 360 LA | 4.00 | 3.58 | 8 | 359.90 | 5.9 |
| 238 LA V6 | 3.90625 | 3.3125 | 6 | 238.19 | 3.9 |
| 488 LA V10 | 4.00 | 3.88 | 10 | 487.58 | 8.0 |
| 505 LA V10 | 4.03 | 3.96 | 10 | 505.12 | 8.3 |
| 350 B | 4.0625 | 3.375 | 8 | 349.98 | 5.7 |
| 361 B | 4.125 | 3.375 | 8 | 360.83 | 5.9 |
| 383 B | 4.25 | 3.375 | 8 | 383.03 | 6.3 |
| 400 B | 4.34 | 3.375 | 8 | 399.42 | 6.5 |
| 383 RB | 4.03125 | 3.75 | 8 | 382.90 | 6.3 |
| 413 RB | 4.1875 | 3.75 | 8 | 413.16 | 6.8 |
| 426 RB | 4.25 | 3.75 | 8 | 425.59 | 7.0 |
| 426 RB Hemi | 4.25 | 3.75 | 8 | 425.59 | 7.0 |
| 440 RB | 4.32 | 3.75 | 8 | 439.72 | 7.2 |
| 286 Magnum Poly | 3.661 | 3.405 | 8 | 286.75 | 4.7 |
| 345 Magnum Hemi | 3.92 | 3.58 | 8 | 345.65 | 5.7 |
| 370 Magnum Hemi | 4.06 | 3.58 | 8 | 370.78 | 6.1 |
