Our call to Powerhouse Products also yielded an E-Z Valve Lash Wrench. The Pro Magnum lifters we installed in anticipation of our high-rpm endeavors take a bit less preload than Comp's regular-duty lifters.

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.

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
4,8,00 544 497
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
Sources
Coast High Performance
Torrance, CA
310.784.1010
coasthigh.com
Comp Cams
Memphis, TN
800.999.0853
compcams.com
Federal Mogul (Fel-Pro Gaskets)
Pontiac, MI
248.354.7700
federal-mogul.com
Powerhouse Products
Memphis, TN
800.872.7223
powerhouseproducts.com