1971 Chevy Camaro Engine - That's Solid
Quick Notes
What we did
A manifold swap and a solid-roller conversion Bottom line
An easy recipe to make over 500 horses from a big-inch small-block Cost (APPROX)
$2,660 391CI Build Sheet
Specifications not listed are the same as stock. Except as noted, all dimensions are in inches or fractions thereof. | Bore x stroke | 4.030 x 3.832 | | Compression | 10:1 | | Valves | 2.02/1.60 | | Rod, center-to-center | 5.70 | | Chamber volume | 70cc (milled 0.035 to achieve from 76cc) | | Rod-bearing clearance | 0.0024 | | Crank endplay | 0.0045 | | Piston ring end gap | 0.024 top; | | | 0.018 second | | CAM SPECS | | Manufacturer | Lunati | | PN | LUN-60133 | | Type | Solid roller | | Valve lift | 0.585/0.600 w/ 1.5:1 rockers; 0.624/640 w/ 1.6:1 rockers | | Duration at 0.050 inch | 249/255 | | Lash | 0.016/0.016 inch, intake/exhaust | | LSA | 110 degrees | Flow Numbers
Although Barkley's 190 AFR cylinder heads have been discontinued for about five years, we did manage to dig up one of our old catalogs to learn the published flow numbers, measured in cfm. | LIFT | 0.200 | 0.300 | 0.400 | 0.500 | 0.600 | | INTAKE | 129 | 195 | 240 | 260 | 262 | | EXHAUST | 108 | 156 | 178 | 190 | 194 | Dyno Details
Headers 1 3/4-to-1 7/8 Hooker Super Comp step headersFuel 91-octane | TEST 1 | | RPM | LB-FT | HP | | 3,500 | 471 | 314 | | 3,600 | 470 | 322 | | 3,700 | 469 | 330 | | 3,800 | 467 | 338 | | 3,900 | 468 | 348 | | 4,000 | 471 | 358 | | 4,100 | 472 | 368 | | 4,200 | 471 | 377 | | 4,300 | 469 | 384 | | 4,400 | 464 | 389 | | 4,500 | 460 | 394 | | 4,600 | 456 | 399 | | 4,700 | 450 | 403 | | 4,800 | 443 | 405 | | 4,900 | 436 | 407 | | 5,000 | 430 | 410 | | 5,100 | 423 | 411 | | 5,200 | 416 | 411 | | 5,300 | 407 | 411 | | 5,400 | 398 | 409 | | AVG TORQUE | | 453 | | AVG POWER | 339 | * Holley carb 670-cfm (PN 90670)
* 68P/80S jets
* Power valve: 6.5
* Dual-plane intakemanifold
* Hydraulic roller camshaft with 217/225 degrees duration at 0.050 inch lift
* Advance: 36 degrees | TEST 2 | | RPM | LB-FT | HP | | 3,500 | 468 | 312 | | 3,600 | 468 | 321 | | 3,700 | 464 | 327 | | 3,800 | 460 | 333 | | 3,900 | 456 | 339 | | 4,000 | 458 | 349 | | 4,100 | 468 | 365 | | 4,200 | 478 | 383 | | 4,300 | 486 | 398 | | 4,400 | 493 | 413 | | 4,500 | 496 | 425 | | 4,600 | 498 | 436 | | 4,700 | 499 | 446 | | 4,800 | 500 | 457 | | 4,900 | 503 | 469 | | 5,000 | 504 | 480 | | 5,100 | 505 | 491 | | 5,200 | 504 | 499 | | 5,300 | 501 | 506 | | 5,400 | 499 | 513 | | 5,500 | 493 | 517 | | 5,600 | 488 | 520 | | 5,700 | 482 | 523 | | 5,800 | 476 | 525 | | 5,900 | 469 | 527 | | 6,000 | 463 | 529 | | 6,100 | 457 | 530 | | 6,200 | 451 | 532 | | 6,300 | 443 | 530 | | 6,400 | 436 | 529 | | 6,500 | 430 | 527 | | AVG TORQUE | 477 | | AVG POWER | 454 | * Holley carb 950 HP
* 78P/78S jets
* Power valve: 6.5
* Holley Strip Dominator manifold
* Lunati solid roller cam
* Scorpion 1.6 roller rockers
* Advance: 36 degrees | TEST 3 | | RPM | LB-FT | HP | | 3,500 | 470 | 313 | | 3,600 | 467 | 320 | | 3,700 | 461 | 325 | | 3,800 | 459 | 332 | | 3,900 | 459 | 341 | | 4,000 | 463 | 352 | | 4,100 | 473 | 369 | | 4,200 | 484 | 387 | | 4,300 | 490 | 401 | | 4,400 | 496 | 415 | | 4,500 | 498 | 427 | | 4,600 | 500 | 438 | | 4,700 | 502 | 449 | | 4,800 | 505 | 462 | | 4,900 | 507 | 473 | | 5,000 | 509 | 485 | | 5,100 | 509 | 495 | | 5,200 | 509 | 504 | | 5,300 | 505 | 510 | | 5,400 | 502 | 516 | | 5,500 | 497 | 520 | | 5,600 | 491 | 523 | | 5,700 | 485 | 526 | | 5,800 | 479 | 529 | | 5,900 | 473 | 531 | | 6,000 | 467 | 533 | | 6,100 | 460 | 535 | | 6,200 | 453 | 535 | | 6,300 | 447 | 536 | | 6,400 | 441 | 537 | | 6,500 | 433 | 536 | | AVG TORQUE | 457 | | AVG POWER | 480 | * 76P/76S Jets
* 1-inch open spacer
* Advance: 34 degrees Bolt-On Parts Cost
All prices sourced through summitracing.com, except where noted. | MFG | PN | Description | Price | | Holley | HLY-300-25 | Intake manifold, Strip Dominator, single-plane | $180 | | | 80509-1 | 830 HP carburetor | $680 | | | 80496-1 | 950 HP carburetor | or $700 | | Lunati | LUN-60133 | Voodoo solid roller camshaft | $309 | | | LUN-72402LUN | Pressurized solid roller lifter, priority oiling system | $586 | | | LUN-93115 | 3-keyway roller timing set, double roller | $141 | | | LUN-74620 K2LUN | Springs, locks, and retainers | $348 | | Manley | 25722-16 | 51/416-inch push rods 8.100-inch | $140 | | Moroso* | MOR-64980 | Carburetor Spacer, Aluminum, 1-inch | $42 | | Scorpion** | SCP 1003 | 1.6, 71/416-inch, roller rocker arms | $215 | | | | TOTAL | $2,661 | *Sold through Vrbancic Bros. Racing**Sold through Scoggin-Dickey Parts Center
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