RPM TEST 1 TEST 2 TQ HP TQ HP BSFC 3,000 514 294 518 296 0.463 3,200 528 322 527 321 0.442 3,400 544 352 549 355 0.422 3,600 547 375 552 378 0.414 3,800 545 395 550 398 0.412 4,000 552 421 554 422 0.407 4,200 564 451 562 450 0.395 4,400 576 482 574 481 0.387 4,600 586 513 585 512 0.389 4,800 590 539 591 540 0.393 5,000 593 565 596 567 0.403 5,200 600 594 603 597 0.409 5,400 603 621 603 620 0.419 5,600 601 640 602 642 0.422 5,800 598 660 601 664 0.415 6,000 595 680 599 684 0.418 6,200 588 695 593 700 0.432 6,400 575 701 580 707 0.449 6,600 557 700 561 705 0.446 Avg. 572 527 575 529 0.417 Power/ci 1.21 1.41 1.21 1.42 CAM SPECS CAM DURATION (ADV.) DURATION (AT 0.050) LIFT LOBE SEP. Comp Xtreme 292, (Intake) 292 254 0.660 110 Mech. roller, (Exhaust) 298 260 0.666 The AFR heads we chose are the smallest rectangle-port heads AFR sells at 305 cc, which we chose to increase the inlet velocity through the ports. The heads come with 2.25/1.88-inch valves and 118cc combustion chambers. What was especially attractive was that the 305's exhaust-flow numbers compared well with most other Rat heads we investigated.The AFR heads we chose are the smallest rectangle-port heads AFR sells at 305 cc, which we Rather than be conservative, we decided to step up to a more aggressive Comp Cams mechanical roller cam to make some decent street power. This also required AFR roller valvesprings to control those massive 2.250-inch intake valves.Rather than be conservative, we decided to step up to a more aggressive Comp Cams mechanic To ensure we had a solid induction system that could feed the fat Rat, we opted for an Edelbrock Victor Jr. single-plane intake and a Barry Grant 850-cfm Mighty Demon carb. Everything we've read claims that even a mild street motor like this could benefit from a larger-cfm carburetor, but our budget demanded a smaller carburetor.To ensure we had a solid induction system that could feed the fat Rat, we opted for an Ede « | 1 | 2 | 3 | 4 | 5 | 6 | » | View Full Article Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
