|
|
1. For testing, our 383 utilized a combination of PerTronix distributor and Flame-Thrower coil. The Flame-Thrower plug-and-play billet distributor offers the Ignitor III electronic ignition module and a 6061-T6 polished billet housing. Plus, a built-in LED allows rev limiter setting. 2. COMP’s solid roller camshaft with a small base circle spec’d out with 0.571-/0.577-inch intake/exhaust and 242/248 degrees intake/exhaust of duration at 0.050 inch. Our lobe separation was 110 degrees. 3. Both manifold testing used a set of Vrbancic dyno headers with 17/8-inch primary tubes. 4. Holley’s Street Avenger offers a trouble-free carburetor that’s calibrated to give you performance without all the headaches. This 870 featured a tunable metering system, fuel filters in the primary and secondary fuel bowls, center-hung floats, external float adjustments with sight plugs, electric choke, emissions accessory ports, adjustable secondaries, power valve saver, and dual-feed conversion fuel line. 5. Oil control was handled by a Milodon low-profile deep sump oil pan with side kick outs. Inside sat a diamond stripper windage tray to keep splash at a minimum. | CAM SPECS | | Manufacturer | COMP Cams | | PN | 12-000-8 | | Type | Solid roller | | Valve Lift | 0.571/0.577 inch, intake/exhaust | | Duration at 0.050 | 242/248, intake/exhaust | | Lash | 0.016/0.018, intake/exhaust | | Lobe Separation Angle | 110 degrees | | DYNO DETAILS | | Size | 383 | Size | 383 | | Intake | Street Warrior dual-plane | Intake | Team G single-plane | | Headers | tk | Headers | tk | | Advance | 36 | Advance | 40 | | Fuel | 91 | Fuel | 91 | | Carb | 870 cfm | Carb | 870 cfm | | Jets | 84/86 | Jets | 84/86 | | Max. Torque | 474 at 4,700 rpm | Max. Torque | 475 at 4,800 rpm | | Max. Power | 490 at 5,800 rpm | Max. Power | 493 at 6,100 rpm | | Avg. Torque | 455 | Avg. Torque | 444 | | Avg. Power | 408 | Avg. Power | 402 | | RPM | TQ | HP | RPM | TQ | HP | | 3,000 | 443 | 253 | 3,000 | 412 | 235 | | 3,100 | 451 | 266 | 3,100 | 416 | 246 | | 3,200 | 456 | 278 | 3,200 | 418 | 255 | | 3,300 | 463 | 291 | 3,300 | 417 | 262 | | 3,400 | 468 | 303 | 3,400 | 421 | 273 | | 3,500 | 470 | 314 | 3,500 | 432 | 288 | | 3,600 | 471 | 323 | 3,600 | 440 | 302 | | 3,700 | 472 | 332 | 3,700 | 444 | 313 | | 3,800 | 470 | 340 | 3,800 | 445 | 322 | | 3,900 | 467 | 347 | 3,900 | 443 | 329 | | 4,000 | 465 | 354 | 4,000 | 443 | 337 | | 4,100 | 464 | 362 | 4,100 | 446 | 348 | | 4,200 | 464 | 371 | 4,200 | 453 | 362 | | 4,300 | 467 | 382 | 4,300 | 460 | 376 | | 4,400 | 469 | 393 | 4,400 | 466 | 391 | | 4,500 | 472 | 405 | 4,500 | 470 | 403 | | 4,600 | 474 | 415 | 4,600 | 473 | 415 | | 4,700 | 474 | 424 | 4,700 | 474 | 424 | | 4,800 | 474 | 433 | 4,800 | 475 | 434 | | 4,900 | 473 | 442 | 4,900 | 475 | 443 | | 5,000 | 473 | 450 | 5,000 | 475 | 452 | | 5,100 | 471 | 457 | 5,100 | 473 | 460 | | 5,200 | 469 | 464 | 5,200 | 472 | 468 | | 5,300 | 466 | 470 | 5,300 | 469 | 473 | | 5,400 | 464 | 477 | 5,400 | 466 | 480 | | 5,500 | 461 | 482 | 5,500 | 462 | 484 | | 5,600 | 455 | 485 | 5,600 | 457 | 487 | | 5,700 | 450 | 488 | 5,700 | 450 | 488 | | 5,800 | 444 | 490 | 5,800 | 444 | 491 | | 5,900 | 437 | 490 | 5,900 | 436 | 490 | | 6,000 | 429 | 490 | 6,000 | 430 | 491 | | 6,100 | 422 | 490 | 6,100 | 424 | 493 | | 6,200 | 413 | 488 | 6,200 | 416 | 491 | | 6,300 | 405 | 486 | 6,300 | 408 | 490 | | 6,400 | 396 | 483 | 6,400 | 400 | 489 | | 6,500 | 388 | 480 | 6,500 | 394 | 487 |  Fel-Pro’s performance head...  Fel-Pro’s performance head gaskets were a perfect match for our 383 build. Our set (PN 1003) featured a 4.166-inch bore and 0.041-inch thickness. They also feature a PermaTorque/blue head gasket body with a solid-steel core to minimize torque loss and blowout. A wire ring combustion chamber seat with stainless steel provides extra sealing force around each combustion chamber.  Before setting down the pair...  Before setting down the pair of Patriot cylinder heads, we threaded in a set of ARP small-block head studs to the block first. They were all treated with a ARP thread sealer since small-block threads enter the water jackets.  We can’t say enough good things...  We can’t say enough good things about these 1.52:1 Ultra Pro Magnum roller rocker lifter arms. We locked all the arms down with the supplied locknuts with a 5/8-inch wrench onto the 7.950-inch intake/exhaust pushrods. Weiand: Dual- vs. Single-Plane For our testing, we tried two manifolds on the dyno. Our Weiand Speed Warrior (dual-plane) intake manifold was first. It featured long, separated runners for bottom-end and midrange power, plus a special runner design and larger plenum to flow the air needed from idle all the way up for high-rpm horsepower at 6,000 rpm. The Weiand Team G (single-plane) manifold is designed to build power further up in the rpm, from 2,000 to 8,000 rpm. The single-plane manifold has a raised plenum for increased flow and isolated water passages for improved cooling. Most models feature integral bosses for nitrous oxide.  Using a set of Fel-Pro 1205...  Using a set of Fel-Pro 1205 intake gaskets, we set the dual-plane manifold down and fastened it with a 3/8-inch wrench. For the dyno pulls with the single-plane manifold, we used the same gaskets.  Partially through our runs...  Partially through our runs on the dyno with the dual-plane manifold, we adjusted the jetting on the Holley 870-cfm carburetor. Bob Vrbancic noticed the engine was leaning out toward the top end of the pulls so we added a larger primary (84 jet) and secondary (86 jet) to add more fuel.  Bob Vrbancic kept a vigil...  Bob Vrbancic kept a vigil eye on the timing and adjusted it accordingly. For the dyno pulls with the dual-plane manifold, Bob put 36 degrees of timing and 40 degrees for the single-plane manifold testing. CHP | THE PARTS BIN | | MFG | PN | ITEM | | COMP | 818-16 | Endure-X solid-roller lifters | | 12-000-8 | Custom grind solid-roller camshaft | | 1604-16 | Ultra Pro Magnum roller rockers | | Fel-Pro | 1881 | One-piece oil pan gasket | | 1003 | Head gasket set | | 1205 | Intake gasket set | | Holley | 0-80870 | Street avenger 870-cfm carburetor | | Patriot Performance | 2068 | Freedom Super Street Series CNC-ported cylinder heads (complete) | | Pertronix | 60103 | Flame-Thrower Coil | | D7100700 | Flame-Thrower plug ’n’ play distributor | | Weiand | 8501 | Street Warrior dual-plane manifold | | 7532 | Team G single-plane manifold |
|