Flow Testing
RHS 180cc Head Flow
RHS 180cc Straight Plug Aluminum
Tested On SuperFlow 600 Flow Bench
Tested By Steve Dulcich
CFM @ 28 inches Water Depression
| Lift | Intake | Exhaust* |
| 0.050 | 31 | 26 |
| 0.100 | 64 | 53 |
| 0.200 | 120 | 102 |
| 0.300 | 161 | 140 |
| 0.400 | 201 | 170 |
| 0.500 | 233 | 188 |
| 0.600 | 248 | 197 |
| 0.700 | 245 | 204 |
| *Exhaust tested with flow pipe |
Dyno TestingDyno Results
Small-block 290 HP GM Crate Engine
Tested On SuperFlow 902 Engine Dyno
Tested At Westech Performance Group
STP Correction Factor
| Torque lb-ft |
| RPM | Test1 | Test2 | Test3 | Test4 |
| 3,000 | 337 | 328 | 391 | 381 |
| 3,200 | 342 | 341 | 389 | 388 |
| 3,400 | 345 | 355 | 400 | 397 |
| 3,600 | 346 | 365 | 410 | 407 |
| 3,800 | 349 | 369 | 418 | 412 |
| 4,000 | 344 | 370 | 420 | 419 |
| 4,200 | 339 | 370 | 421 | 497 |
| 4,400 | 335 | 369 | 419 | 581 |
| 4,600 | 330 | 366 | 418 | 575 |
| 4,800 | 324 | 361 | 417 | 555 |
| 5,000 | 314 | 355 | 414 | 532 |
| 5,200 | 297 | 348 | 407 | 505 |
| 5,400 | 281 | 338 | 398 | 486 |
| 5,600 | 270 | 311 | 387 | 466 |
| 5,800 | - | 289 | 369 | 439 |
| Horsepower (STP) |
| RPM | Test 1 | Test 2 | Test 3 | Test 4 |
| 3,000 | 193 | 187 | 223 | 218 |
| 3,200 | 208 | 208 | 237 | 236 |
| 3,400 | 223 | 230 | 259 | 257 |
| 3,600 | 237 | 250 | 281 | 277 |
| 3,800 | 253 | 267 | 303 | 298 |
| 4,000 | 262 | 282 | 320 | 319 |
| 4,200 | 271 | 296 | 337 | 398 |
| 4,400 | 281 | 309 | 351 | 487 |
| 4,600 | 289 | 321 | 366 | 504 |
| 4,800 | 296 | 330 | 381 | 507 |
| 5,000 | 299 | 338 | 394 | 506 |
| 5,200 | 294 | 345 | 403 | 501 |
| 5,400 | 289 | 348 | 409 | 500 |
| 5,600 | 287 | 332 | 412 | 497 |
| 5,800 | | 319 | 408 | 484 |