| CAMSHAFT | DURATION
@ 0.050 | LIFT
(INCHES) | LOBE
SEPARATION
ANGLE (LSA) |
| '99-'00 LQ4, Int. | 191 | 0.457 | 114 |
| PN 12560967, Exh. | 190 | 0.466 |
| '01-'06 LQ4, Int. | 196 | 0.467 | 116 |
| PN 12561721, Exh. | 207 | 0.479 |
| GMPP Hot Cam, Int. | 219 | 0.525 | 112 |
| PN 12480033, Exh. | 228 | 0.525 |
Gen III Family Tree
The following is a genealogy of sorts, listing the bore and stroke combinations for the popular GM Gen III engines. Starting with the 5.3L engines, the stroke is consistent at 3.622 inches, with the larger bore being the difference in the displacement.
| ENGINE | DISPLACEMENT
(CUBIC INCHES) | BORE/STROKE | COMPRESSION | ROD LENGTH |
| 4.8 | 293 | 3.78/3.268 | 9.5 | 6.276 |
| 5.3 | 325 | 3.78/3.622 | 9.5 | 6.098 |
| 5.7 | 346 | 3.898/3.622 | 9.5 | 6.098 |
| 5.7 | 346 | 3.898/3.622 | 10.1 | 6.098 |
| 6.0 (LQ4) | 364 | 4.00/3.622 | 9.4 | 6.098 |
| 6.0 (LQ9) | 364 | 4.00/3.622 | 10.0 | 6.098 |
Test 1 was with the stock, iron 6.0L short-block and production iron heads assisted with a GMPP single-plane intake manifold, a 750 Holley carburetor, and a set of 131/44-inch Kooks long-tube headers.
Test 2 kept all the original changes from Test 1 but added the GMPP hydraulic roller Hot cam and valvespring kit.
| | TEST 1 | TEST 2 |
| RPM | TQ | HP | TQ | HP |
| 2,200 | 406 | 170 | 399 | 168 |
| 2,400 | 403 | 184 | 392 | 179 |
| 2,600 | 403 | 199 | 393 | 194 |
| 2,800 | 406 | 216 | 401 | 214 |
| 3,000 | 411 | 235 | 414 | 237 |
| 3,200 | 418 | 255 | 427 | 260 |
| 4,300 | 424 | 275 | 435 | 281 |
| 3,600 | 429 | 294 | 438 | 299 |
| 3,800 | 433 | 313 | 437 | 315 |
| 4,000 | 436 | 332 | 434 | 331 |
| 4,200 | 437 | 350 | 434 | 347 |
| 4,400 | 439 | 368 | 436 | 366 |
| 4,600 | 439 | 384 | 441 | 387 |
| 4,800 | 437 | 399 | 447 | 408 |
| 5,000 | 432 | 411 | 450 | 428 |
| 5,200 | 424 | 420 | 450 | 444 |
| 5,400 | 412 | 424 | 444 | 456 |
| 5,600 | 398 | 425 | 436 | 466 |
| 5,800 | 383 | 424 | 430 | 475 |
| 6,000 | 367 | 419 | 423 | 483 |
| Avg. | 417 | 318 | 428 | 336 |
| Power/ci | 1.20 | 1.16 | 1.23 | 1.32 |
| (peak) |