Power By The NumbersOur original LPE-built 420ci small-block was fitted with an ACCEL/DFI SuperRam intake manifold. In that configuration, the engine produced a respectable 525 hp at 5,500 rpm and a peak torque of 542 lb-ft at 4,500.
Test 1 is the 420ci fitted with the ACCEL intake and four-barrel throttle-body.Test 2 is the same configuration except with the larger three-barrel throttle-body.Test 3 is the same configuration except with the monster two-barrel throttle-body.
| TEST 1 | TEST 2 | TEST 3 |
| RPM | TQ | HP | TQ | HP | TQ | HP |
| 3,000 | 500 | 286 | 503 | 289 | 516 | 295 |
| 3,200 | 506 | 308 | 505 | 308 | 521 | 317 |
| 3,400 | 508 | 329 | 514 | 333 | 525 | 340 |
| 3,600 | 508 | 348 | 515 | 353 | 523 | 358 |
| 3,800 | 506 | 365 | 512 | 370 | 521 | 377 |
| 4,000 | 513 | 391 | 520 | 396 | 530 | 403 |
| 4,200 | 516 | 413 | 521 | 417 | 534 | 427 |
| 4,400 | 521 | 436 | 526 | 440 | 541 | 453 |
| 4,600 | 525 | 460 | 530 | 464 | 547 | 478 |
| 4,800 | 528 | 483 | 532 | 486 | 546 | 499 |
| 5,000 | 523 | 498 | 531 | 505 | 543 | 517 |
| 5,200 | 517 | 512 | 527 | 522 | 538 | 533 |
| 5,400 | 507 | 522 | 516 | 530 | 531 | 545 |
| 5,600 | 502 | 535 | 506 | 540 | 522 | 557 |
| 5,800 | 486 | 536 | 494 | 546 | 506 | 559 |
| 6,000 | 470 | 537 | 475 | 543 | 489 | 558 |
| 6,200 | 454 | 535 | 456 | 539 | 474 | 560 |
| 6,400 | 431 | 526 | 437 | 534 | 447 | 545 |