RHS Head Swap - LQ=HP

A Bumpstick Swap and a Set of RHS’ New Heads Make a Truck Motor Really Haul.

John Nelson Dec 28, 2011 0 Comment(s)
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What’s it Flow?

(cfm at 28 inches H2O)
RHS Pro Action 225cc Cylinder Heads
0.200 0.300 0.400 0.500 0.550 0.600
2.055 intake 144 202 254 290 301 313
1.600 exhaust 109 154 187 205 210 214

More stuff to make it fit

When it comes time to drop this newly possessed powerplant into its new home, we’ll also need a way to connect the modern Gen III engine to the old-school Turbo 400 trans our Chevelle will be running. For this, we sourced TCI for one of its 168-tooth internal balance flexplates. This stout piece is 0.035-inch thicker than stock, and the starter ring is welded to the plate on both sides for increased strength.

1202chp 12 O  Rhs Head Swap Flexplates 2/15

Cam Shaft

Manufacturer: COMP Cams
PN: 54-428-11
Grind Number: XR281HR
Type: hydraulic roller
Valve lift: 0.571/0.573-inch intake/exhaust
Duration at 0.050: 228/230 degrees intake/exhaust
Lobe separation: 112 degrees
RPM LB-FT HP
3,000 419 239
3,100 415 245
3,200 415 253
3,300 419 263
3,400 426 276
3,500 432 288
3,600 437 300
3,700 441 311
3,800 445 322
3,900 448 333
4,000 453 345
4,100 455 355
4,200 455 364
4,300 456 373
4,400 458 384
4,500 459 393
4,600 458 401
4,700 457 409
4,800 457 418
4,900 459 428
5,000 460 438
5,100 460 446
5,200 458 454
5,300 456 460
5,400 453 466
5,500 450 471
5,600 445 475
5,700 441 479
5,800 437 483
5,900 433 487
6,000 429 491
6,100 425 493
6,200 419 495
6,300 413 495
6,400 405 493
6,500 397 491
Average Torque 453
Average Power 409

RHS Pro Action cylinder heads

Advance: 32 degrees
rpm lb-ft hp
3,000 431 246
3,100 427 252
3,200 425 259
3,300 428 269
3,400 436 282
3,500 442 295
3,600 447 306
3,700 450 317
3,800 454 329
3,900 460 341
4,000 465 354
4,100 467 365
4,200 468 374
4,300 469 384
4,400 470 394
4,500 470 403
4,600 470 412
4,700 471 421
4,800 472 432
4,900 474 443
5,000 476 453
5,100 476 462
5,200 475 470
5,300 472 477
5,400 470 483
5,500 466 489
5,600 463 494
5,700 460 499
5,800 458 505
5,900 455 511
6,000 451 516
6,100 446 518
6,200 441 520
6,300 435 521
6,400 428 521
6,500 421 521
Average Torque 468
Average Power 424

Sources

Automotive Racing Products
Ventura , CA 93003
800-826-3045
www.arp-bolts.com
AMSOIL
Superior, WI 54880
800-777-8491
www.amsoil.com
Comp Cams
Memphis, TN 38118
800-999-0853
http://www.compcams.com
Westech Performance
Mira Loma, CA 91752
951-685-4767
www.westechperformance.com
TCI
Ashland, MS 38603
888-776-9824
www.tciauto.com

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