| 4,200 | 428 | 342 | 432 | 346 | + 4 | + 4 |
| 4,400 | 425 | 356 | 433 | 363 | + 8 | + 7 |
| 4,600 | 420 | 368 | 429 | 375 | + 9 | + 7 |
| 4,800 | 415 | 380 | 426 | 389 | +11 | + 9 |
| 5,000 | 407 | 387 | 420 | 400 | +13 | +13 |
| 5,200 | 397 | 393 | 411 | 407 | +14 | +14 |
| 5,400 | 385 | 396 | 401 | 412 | +16 | +16 |
| 5,600 | 375 | 401 | 392 | 418 | +17 | +17 |
| 5,800 | 360 | 397 | 380 | 420 | +20 | +23 |
| 6,000 | 338 | 386 | 368 | 420 | +30 | +34 |
| 6,200 | - | - | 355 | 419 | - | - |
| 6,400 | - | - | 339 | 412 | - | - |
| Avg. | 401 | 326 | 403 | 342 | |
Cam SpecsWe've included the specs on the stock 350 H.O. cam, the GMPP Hot hydraulic roller, and the custom Comp 280 mechanical Street Roller. It's not accurate to compare advertised duration flat tappet or hydraulic roller specs to mechanical roller cams, but at least the duration at 0.050 numbers can be used. Keep in mind that the mechanical roller lash must be subtracted from the valve lift specs to get an accurate idea of net valve lift for mechanical roller cams. We've included those net lift numbers in parenthesis.