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Chevy Cylinder Heads - Power Curves
 

CATEGORY 2
MODEL: Cast-Iron SB-Chevy Cylinder Heads, 200cc
PN: 12320-01
PRICE: $1000/pair
Weight: 51 pounds each
True measured combustion chamber volume 72 cc
True measured intake and exhaust port volume: 200 cc; 75 cc
Spring pressure: 115 lbs. on seat; 275 lbs. at 0.0500-inch lift
installed height: 1.850 inch
Valve size: 2.06/1.60-inch
Intake flow at 0.400 lift: 209.5 cfm
Complete, assembled with guideplates
JEG'S
800.345.4545 · jegs.com

Airflow
Valve lift .050 .100 .200 .300 .400 .500 .600
Intake Corr test flow 30 65 122 170 210 233 263
Exhaust Corr test flow 22 45 91 128 152 167 176

POWER
Average torque: 432 lb-ft
Average horsepower: 381 hp
RPM lb-ft HP      
3,200 442 269 4,700 452 404
3,300 442 278 4,800 446 408
3,400 450 291 4,900 439 410
3,500 457 304 5,000 434 413
3,600 458 314 5,100 429 416
3,700 463 326 5,200 424 420
3,800 466 337 5,300 418 422
3,900 468 347 5,400 409 421
4,000 467 356 5,500 403 422
4,100 467 364 5,600 395 421
4,200 465 372 5,700 384 416
4,300 463 379 5,800 374 413
4,400 461 386 5,900 367 413
4,500 459 393 6,000 361 412
4,600 456 399 6,100 348 404

CATEGORY 2
MODEL: Competition Products, aluminum 180cc
PN: 300102
PRICE: $880/pair
Weight: 25 pounds each
True measured combustion chamber volume: 67 cc
True measured intake and exhaust port volume: 195 cc; 60 cc
Spring pressure: 115 lbs. on seat; 275 lbs. at 0.500-inch lift
installed height: 1.850 inch
Valve size: 2.06/1.60-inch
Intake flow at 0.400 lift: 194 cfm
Assembled, with guideplates
COMPETITION PRODUCTS
800.233.0199 · competitionproducts.com

Airflow
Valve lift .050 .100 .200 .300 .400 .500 .600
Intake Corr test flow 29 58.8 112 152 194 231 256
Exhaust Corr test flow 23.1 50.1 91.5 122.3 152 167 172

POWER
Average torque:
 428 lb-ft
Average horsepower: 377hp
RPM lb-ft HP      
3,200 450 274 4,700 447 400
3,300 451 283 4,800 441 403
3,400 453 293 4,900 436 407
3,500 458 305 5,000 428 407
3,600 464 318 5,100 422 410
3,700 468 330 5,200 416 412
3,800 470 340 5,300 408 411
3,900 469 349 5,400 400 411
4,000 469 357 5,500 390 409
4,100 470 367 5,600 384 409
4,200 468 374 5,700 373 405
4,300 464 380 5,800 362 400
4,400 462 387 5,900 353 397
4,500 457 391 6,000 345 394
4,600 453 397 6,100 335 389

CATEGORY 2
MODEL: Trick Flow aluminum, 195cc
PN: 30400001
PRICE: $1026/pair
Weight: 26 pounds each
True measured combustion chamber volume: 64 cc
True measured intake and exhaust port volume: 195 cc; 73 cc
Spring pressure: 115 lbs. on seat; 275 lbs. at 0.500-inch lift
installed height: 1.850 inch
Valve size: 2.02/1.60-inch
Intake flow at 0.400 lift: 215 cfm
Assembled, with guideplates
SUMMIT RACING
800.230.3030 · summitracing.com

Airflow
Valve lift .050 .100 .200 .300 .400 .500 .600
Intake Corr test flow 29.5 60.3 125 173.6 215 239 243
Exhaust Corr test flow 18 43 86.5 116.7 144 162 175

POWER
Average torque: 428 lb-ft
Average horsepower: 377 hp
RPM lb-ft HP 4,700 478 428
3,300 482 303 4,800 474 433
3,400 481 312 4,900 471 439
3,500 483 322 5,000 467 444
3,600 489 335 5,100 463 449
3,700 491 346 5,200 456 452
3,800 494 357 5,300 451 455
3,900 495 368 5,400 443 455
4,000 496 378 5,500 431 451
4,100 494 386 5,600 424 452
4,200 493 394 5,700 415 451
4,300 492 403 5,800 406 449
4,400 491 411 5,900 400 449
4,500 489 419 6,000 391 446
4,600 484 423 6,100 380 442

CATEGORY 3
MODEL: World, Motown 220cc Cast-Iron Head
PN: 014150-2
PRICE: $980/pair
Weight: 52 pounds each
True measured combustion chamber volume: 67 cc
True measured intake and exhaust port volume: 220 cc; 79 cc
Spring pressure: 115 lbs. on seat; 270 lbs. at 0.500-inch lift
INSTALLED HEIGHT: 1.850 inch
Valve size: 2.06/1.60-inch
Intake flow at 0.400 lift: 222 cfm
Complete, assembled with guideplates
COMPETITION PRODUCTS
800.233.0199 · competitionproducts.com

Airflow
Valve lift .050 .100 .200 .300 .400 .500 .600
Intake Corr test flow 31 60 123 177 222 243 260
Exhaust Corr test flow 23 50 109 142 172 187 195

POWER
Average torque 445 lb-ft
Average horsepower: 393 hp
RPM lb-ft HP 4,800 457 417
3,200 460 280 4,900 449 419
3,300 457 287 5,000 445 423
3,400 460 298 5,100 440 427
3,500 467 311 5,200 437 433
3,600 471 323 5,300 431 435
3,700 475 335 5,400 427 439
3,800 478 346 5,500 419 438
3,900 477 354 5,600 411 438
4,000 476 363 5,700 400 434
4,100 476 371 5,800 393 434
4,200 475 380 5,900 387 434
4,300 472 386 6,000 379 432
4,400 470 394 6,100 373 434
4,500 467 400 6,200 362 427
4,600 465 408 6,300 350 420
4,700 463 414 6,400 336 409

CATEGORY 3
MODEL: Dart Cast Iron Eagle Platinum Assemblies,215cc, Stage 2
PN: 10510020PK2
PRICE: $960/pair
Weight: 52 pounds each
True measured combustion chamber volume: 65 cc
True measured intake and exhaust port volume: 215 cc
Spring pressure: 110 lbs. on seat; 280 lbs. at 0.500-inch
installed height 1.850 inch
Valve size: 2.05/1.60-inch
Intake flow at 0.400 lift: 220 cfm
Complete, with guideplates
COMPETITION PRODUCTS
800.233.0199 · competitionproducts.com

Airflow
Valve lift .050 .100 .200 .300 .400 .500 .600
Intake Corr test flow 32 63 132 180 220 251 272
Exhaust Corr test flow 19 56 106 133 162 178 182

POWER
Average torque: 447 lb-ft
Average horsepower: 396 hp
RPM lb-ft HP      
3,200 446 272 4,700 466 417
3,300 447 281 4,800 462 422
3,400 452 292 4,900 457 426
3,500 459 306 5,000 452 431
3,600 465 319 5,100 446 433
3,700 471 332 5,200 441 436
3,800 476 344 5,300 436 440
3,900 477 354 5,400 432 444
4,000 478 364 5,500 427 447
4,100 478 373 5,600 422 450
4,200 476 381 5,700 413 448
4,300 475 388 5,800 401 443
4,400 473 396 5,900 395 443
4,500 471 404 6,000 383 437
4,600 468 410 6,100 372 432

Westech Performance Group
11098 Venture Dr., Unit C
Mira Loma
CA  91752
9-09/-685-4767
www.westechperformance.com
Full Article
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