| The Cam Box |
| Camshaft | | Adv. | Duration | Lift | Lobe |
| | Duration | @ 0.050 | (inches) | Sep. |
| | (0.006-inch) | |
| Stock 5.3L | Int. | 259 | 190 | 0.456 | 114.0 |
| Hyd. Roller | Ex. | 259 | 190 | 0.464 |
| LPE GT2-3 | Int. | 255 | 206 | 0.571 | 118.5 |
| Hyd. Roller | Ex. | 282 | 221 | 0.578 |
| LPE GT1-1 | Int. | 276 | 229 | 0.631 | 114.5 |
| Hyd. Roller | Ex. | 303 | 242 | 0.631 |
| Component List |
| Description | Manufacturer | Part Number |
| Camshaft, aggressive hyd. roller | LPE | GT1-1 |
| CNC ported Gen III heads | LPE | LNO-227-350-08 |
| Steel roller rocker stand | LPE | LPE-RKR-STAND |
| Pushrods, Hi-Tech | Comp Cams | 7950-16 |
| Valvesprings, conical, LS1 | Comp Cams | 26918 |
| LSX intake, 78mm throttle-body | Comp Cams | 54001 |
| LSX intake, 90mm throttle-body | Comp Cams | 54003 |
Test ResultsWe begin this month with Test 4, which was the highest power run from last month's Part 1 story.
Test 4: Stock 5.3L SSR truck engine with 131/44-inch headers, stock heads, and the larger LPE hydraulic roller cam.
Test 5: This test included LPE CNC-ported heads and larger injectors.
Test 6: This included all the above modifications plus an F-car front accessory drive system and the Comp Cams LSX intake manifold.
| TEST 4 | TEST 5 | TEST 6 | DIFF |
| RPM | TQ | HP | TQ | HP | TQ | HP | TQ | HP |
| 2,000 | 281 | 108 | 295 | 113 | 294 | 113 | +13 | +5 |
| 2,200 | 261 | 110 | 268 | 113 | 272 | 113 | +9 | +3 |
| 2,400 | 272 | 125 | 278 | 129 | 278 | 129 | +6 | +4 |
| 2,600 | 297 | 149 | 298 | 149 | 302 | 150 | +5 | +1 |
| 2,800 | 308 | 164 | 318 | 170 | 321 | 171 | +13 | +7 |
| 3,000 | 325 | 188 | 331 | 189 | 335 | 193 | +10 | +5 |
| 3,200 | 337 | 205 | 344 | 212 | 344 | 212 | +7 | +7 |
| 3,400 | 337 | 219 | 344 | 223 | 344 | 223 | +7 | +4 |
| 3,600 | 339 | 233 | 347 | 239 | 347 | 239 | +8 | +6 |
| 3,800 | 337 | 244 | 346 | 251 | 348 | 252 | +11 | +8 |
| 4,000 | 335 | 255 | 343 | 263 | 345 | 265 | +10 | +10 |