Valve Spring Tech - Rev Happy
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| DYNO DETAILS | | Headers: | 131/44-inch Hedman long-tubes | | Fuel: | 91-octane unleaded | | Advance: | 37 degrees | | Intake manifold: | Edelbrock Victor Jr., port-matched | | carburetor: | 825-cfm Mighty Demon | | Jetting: | 83 primaries/87 secondaries | | Max torque: | 529.6 lb-ft at 4,900 rpm | | Max power: | 574.2 hp at 6,500 rpm | | Average torque: | 476.5 lb-ft | | Average power: | 434.1 hp | GLORY RUN
The point of this exercise was to demonstrate the vastly improved valve control we achieved by switching to beehive valvesprings, as opposed to chasing peak power. Ah, who are we kidding? There was time for a glory run at the end of the day, and this is CHEVY HIGH PERFORMANCE, right? Dyno details are as before, except we bumped the timing up to 39 degrees and fattened up our Mighty Demon mixer with an 85 primary/90 secondary jet combo. Our rev-happy 406 rewarded us with 4 more horsepower and 11 extra pound-feet of torque when compared to our Jan. '07 test, made with a 750-cfm Mighty Demon, with gains shown throughout the powerband. Our old nemesis valve bounce was nowhere to be found. | |
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| RPM | LB-FT | HP | | 2,600 | 392 | 194 | | 2,700 | 396 | 204 | | 2,800 | 403 | 215 | | 2,900 | 412 | 227 | | 3,000 | 421 | 241 | | 3,100 | 435 | 257 | | 3,200 | 451 | 275 | | 3,300 | 465 | 292 | | 3,400 | 476 | 308 | | 3,500 | 484 | 323 | | 3,600 | 492 | 337 | | 3,700 | 500 | 352 | | 3,800 | 506 | 366 | | 3,900 | 511 | 379 | | 4,000 | 516 | 393 | | 4,100 | 520 | 406 | | 4,200 | 525 | 420 | | 4,300 | 530 | 434 | | 4,400 | 535 | 448 | | 4,500 | 538 | 461 | | 4,600 | 541 | 473 | | 4,700 | 542 | 485 | | 4,800 | 544 | 497 | | 4,900 | 544 | 508 | | 5,000 | 544 | 518 | | 5,100 | 543 | 527 | | 5,200 | 542 | 536 | | 5,300 | 540 | 544 | | 5,400 | 537 | 552 | | 5,500 | 533 | 558 | | 5,600 | 529 | 564 | | 5,700 | 524 | 569 | | 5,800 | 519 | 574 | | 5,900 | 514 | 578 | | 6,000 | 509 | 582 | | 6,100 | 503 | 584 | | 6,200 | 496 | 586 | | 6,300 | 489 | 586 | | 6,400 | 481 | 586 | | 6,500 | 473 | 586 | | 6,600 | 467 | 587 | | 6,700 | 458 | 585 | | 6,800 | 444 | 575 | | 6,900 | 430 | 565 | | 7,000 | 416 | 555 | Average torque 490.4 lb-ft Average power 447.3 hp
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