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Mopar "B", "RB" & Hemi Bore & Stroke Chart

To use this Chart
1. Confirm original displacement.
2. Select motor type and/or bore size in Column 1.
3. Confirm exact bore size in Column 2.
4. Select your stroke length in Columns 3-8.
5. Displacement appears in the intersecting box.
Bore Size
(Relative)		 Bore Size
(Absolute)		 "B" 3.375"
(383, 400)		 "RB" 3.75"
(413, 426, 440)		 "RB" 3.915"
Offset		 4.15"
Mopar		 4.25"
After-Mkt.		 4.50"
After-Mkt.
Std. 383, 426 4.2500 383 426 444 471 482 511
+.010 4.2600 385 428 446 473 485 513
+.020 4.2700 387 430 449 475 487 516
+.030 4.2800 388 432 451 478 489 518
+.040 4.2900 390 434 453 480 491 520
+.050 4.3000 392 436 455 482 494 523
+.060 4.3100 394 438 457 484 496 525
Std. 440 4.3200 396 440 459 487 498 528
+.010 4.3300 398 442 461 489 501 530
Std. 400 4.3400 399 444 463 491 503 533
+.030 4.3500 401 446 465 493 505 535
+.040 4.3600 403 448 468 496 508 537
+.050 4.3700 405 450 470 498 510 540
+.060 4.3800 407 452 472 500 512 542
+.070 4.3900 409 454 474 503 515 545
Mega 4-7/16" 4.4375 418 464 484 513 526 557
Mega 4-1/2" 4.5000 429 477 498 528 541 573
Mega 4-9/16" 4.5625 441 490 512 543 556 589
Mega 4-5/8" 4.6250 454 504 526 558 571 605
Notes
400 std. bore = 440 + .020"; 400 +.010" = 440 + .030", etc.
426 bore & stroke includes "street wedge", Max Wedge (Ramcharger) & 426" hemi.
350, 361, 383 & 400 all use the same 3.375" (3-3/8") stroke length.
Mopar (and Indy, Merlin, & other aftermarket) siamese-bore blocks can be bored to 4-5/8" (4.625"), but this is not recommended. The usual size for best effect is 4-1/2" (4.50").
"440 Offset" is made to any size between 3.585" and 3.915" by eccentrically regrinding the rod journals from 2.375" (std. Chrysler size) to 2.20" (BBC size). The full difference (.175") is not practical as an increase, as it allows no margin for wear, error, etc. Normally .010" "safety" is sufficient, so the maximum increase is .165", or 3.915". Cranks prepared in this way must use special rods with BBC-size big end ID. Actual BBC rods are too narrow, and will cause excessive oil pressure loss.

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