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The Breakdown | CATEGORY 1 | | MODEL: | Aerohead Cast Iron, 165cc | | PN: | ARO-CH-1D-SS | | PRICE: | $625/pair | | Weight: | 52 pounds each | | True measured combustion chamber volume: | 73 cc | | True measured intake and exhaust port volume: | 178 cc; 70 cc | | Spring pressure: | 90 lbs. on seat; 270 lbs. at 0.500-inch lift | | installed height: | 1.850 inch | | Valve size: | 1.94/1.50-inch | | Intake flow at 0.400 lift: | 219 cfm | | Complete, no guideplates | | AEROHEAD RACING | | 317.862.0223 | aeroheadracing.com | | Airflow | | Valve lift | .050 | .100 | .200 | .300 | .400 | .500 | .600 | | Intake Corr test flow | 29.5 | 60 | 116 | 162 | 219 | 225 | 226 | | Exhaust Corr test flow | 22.5 | 48 | 101 | 141 | 171 | 185 | 188 | | POWER | | Average torque | 440 lb-ft | | Average horsepower | 389 | | RPM | lb-ft | HP | | | | | 3,200 | 446 | 272 | 4,700 | 457 | 409 | | 3,300 | 448 | 281 | 4,800 | 451 | 412 | | 3,400 | 454 | 294 | 4,900 | 445 | 415 | | 3,500 | 460 | 307 | 5,000 | 442 | 420 | | 3,600 | 464 | 318 | 5,100 | 438 | 425 | | 3,700 | 470 | 331 | 5,200 | 432 | 427 | | 3,800 | 475 | 343 | 5,300 | 426 | 429 | | 3,900 | 476 | 353 | 5,400 | 420 | 432 | | 4,000 | 475 | 362 | 5,500 | 410 | 429 | | 4,100 | 473 | 369 | 5,600 | 404 | 431 | | 4,200 | 472 | 377 | 5,700 | 396 | 430 | | 4,300 | 471 | 385 | 5,800 | 388 | 428 | | 4,400 | 469 | 393 | 5,900 | 379 | 426 | | 4,500 | 467 | 400 | 6,000 | 372 | 425 | | 4,600 | 461 | 404 | 6,100 | 359 | 416 | | CATEGORY 1 | | MODEL: | Edelbrock Performer RPM aluminum, 170cc | | PN: | 60899 | | PRICE: | $999/pair | | Weight: | 27 pounds each | | True measured combustion chamber volume: | 64 cc | | True measured intake and exhaust port volume: | 185 cc; 63 cc | | Spring pressure: | 125 lbs. on seat; 230 lbs. at 0.500-inch lift | | installed height: | 1.850 inch | | Valve size: | 2.02/1.60-inch | | Intake flow at 0.400 lift: | 223 cfm | | Complete, assembled with guideplates | | SUMMIT RACING | | 800.230.3030 · | summitracing.com | | Airflow | | Valve lift | .050 | .100 | .200 | .300 | .400 | .500 | | Intake Corr test flow | 29.4 | 59.6 | 124.7 | 80.6 | 223 | 244 | | Exhaust Corr test flow | 20.7 | 48.3 | 96.5 | 134 | 161 | 176 | | POWER | | Average torque: | 458 lb-ft
| | Average horsepower: | 405 hp | | RPM | lb-ft | HP | 4,700 | 474 | 424 | | 3,300 | 475 | 298 | 4,800 | 471 | 430 | | 3,400 | 474 | 307 | 4,900 | 466 | 435 | | 3,500 | 478 | 319 | 5,000 | 461 | 439 | | 3,600 | 481 | 330 | 5,100 | 455 | 442 | | 3,700 | 488 | 344 | 5,200 | 450 | 445 | | 3,800 | 490 | 355 | 5,300 | 446 | 450 | | 3,900 | 490 | 364 | 5,400 | 438 | 451 | | 4,000 | 490 | 373 | 5,500 | 431 | 452 | | 4,100 | 489 | 381 | 5,600 | 422 | 450 | | 4,200 | 488 | 391 | 5,700 | 414 | 449 | | 4,300 | 489 | 400 | 5,800 | 407 | 449 | | 4,400 | 485 | 407 | 5,900 | 399 | 448 | | 4,500 | 481 | 412 | 6,000 | 388 | 443 | | 4,600 | 478 | 418 | 6,100 | 379 | 440 | | CATEGORY 1 | | MODEL: | Cast-Iron Vortec GM Performance Parts, 170cc | | PN: | SD8060A | | PRICE: | $680/pair | | Weight: | 46 pounds each | | True measured combustion chamber volume: | 63 cc | | True measured intake and exhaust port volume: | 185 cc; 63 cc | | Spring pressure: | 70 lbs. on seat; 265 lbs. at 0.500-inch lift | | installed height: | 1.850 inch | | Valve size: | 1.94/1.50-inch | | Intake flow at 0.400 lift: | 212 cfm | | Assembled, guide plates not offered | | SCOGGIN-DICKY PARTS CENTER | | 800.456.0211 · | sdpc2000.coom | | Airflow | | Valve lift | .050 | .100 | .200 | .300 | .400 | .500 | .600 | | Intake Corr test flow | 30 | 57 | 123 | 174 | 212 | 210 | 207 | | Exhaust Corr test flow | 19 | 40 | 100 | 139 | 153 | 160 | 162 | | POWER | | Average torque: | 445 lb-ft | | Average horsepower: | 392 hp | | RPM | lb-ft | HP | 4,700 | 462 | 414 | | 3,300 | 469 | 295 | 4,800 | 455 | 416 | | 3,400 | 471 | 305 | 4,900 | 450 | 420 | | 3,500 | 474 | 316 | 5,000 | 445 | 424 | | 3,600 | 481 | 330 | 5,100 | 440 | 427 | | 3,700 | 484 | 341 | 5,200 | 434 | 429 | | 3,800 | 487 | 353 | 5,300 | 427 | 430 | | 3,900 | 489 | 363 | 5,400 | 417 | 429 | | 4,000 | 489 | 372 | 5,500 | 409 | 428 | | 4,100 | 486 | 379 | 5,600 | 399 | 425 | | 4,200 | 483 | 386 | 5,700 | 389 | 423 | | 4,300 | 481 | 394 | 5,800 | 380 | 420 | | 4,400 | 476 | 399 | 5,900 | 370 | 415 | | 4,500 | 473 | 405 | 6,000 | 360 | 411 | | 4,600 | 467 | 409 | 6,100 | 351 | 408 |
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