LS Engine Performance - LS Power For Less
GM Engineers Tell Super Chevy How To Build The Best Budget LS Combos With Factory Parts.
Photography by GM Corp, Jim McCraw
PART NUMBER 12565308
PRODUCTION 2002 LS6 5.7L CAMSHAFT.
117.5 LDA 120 INTAKE CENTERLINE.
1.70 ROCKER RATIO |
| Lift: |
| | @Cam | @Valve | |
| | EXHAUST: 0.322 | 0.548 | |
| | INTAKE: 0.324 | 0.551 | |
| Cam Timing@0.004-inch Tappet Lift: |
| Open | | Close | Adv. Duration |
| | EXHAUST: 69 BBDC | 33 ATDC | 282 |
| | INTAKE: 7 BTDC | 80 ABDC | 267 |
| Cam Timing@0.050-inch Tappet Lift: |
| Open | | Close | Duration |
| | EXHAUST: 42 BBDC | 4 BTDC | 218 |
| | INTAKE: 19 ATDC | 43 ABDC | 204 |
LS7:
1.8 ROCKER RATIO
120 INTAKE CENTERLINE, 120.5 LOBE
DISPLACEMENT ANGLE |
| Lift: |
| | @Cam | @Valve | |
| | EXHAUST: 0.328 | 0.588 | |
| | INTAKE: 0.331 | 0.593 | |
| Cam Timing@0.004-inch Tappet Lift: |
| | Open | Close | Adv. Duration |
| | EXHAUST: 80 BBDC | 35 ATDC | 295 |
| | INTAKE: 8 BTDC | 89 ABDC | 277 |
| Cam Timing@0.050-inch Tappet Lift: |
| | Open | Close | Duration |
| | EXHAUST: 52 BBDC | 2 BTDC | 230 |
| | INTAKE: 18 ATDC | 49 ABDC | 211 |
LSA 12605220 CAM CARD INFORMATION:
119 INTAKE CENTERLINE, 119 LOBE DISPLACEMENT ANGLE
1.70 ROCKER RATIO |
| Lift: |
| | @Cam | @Valve | |
| | EXHAUST: 0.283 | 0.480 = 12.2 mm | |
| | INTAKE: 0.283 | 0.480 = 12.2 mm | |
| Cam Timing@0.004-inch Tappet Lift: |
| | Open | Close | Adv. Duration |
| | EXHAUST: 79 BBDC | 34 ATDC | 293 |
| | INTAKE: 5 BTDC | 86 ABDC | 271 |
| Cam Timing@0.050-inch Tappet Lift: |
| | Open | Close | Duration |
| | EXHAUST: 46 BBDC | 10 BTDC | 216 |
| | INTAKE: 21 ATDC | 39 ABDC | 198 |
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