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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
LS9 12605227 CAM CARD INFORMATION:
122 INTAKE CENTERLINE, 122.5 LOBE
DISPLACEMENT ANGLE
1.70 ROCKER RATIO
Valve Lift:
  @Cam @Valve  
  EXHAUST: 0.328 0.558 = 14.2 mm  
  INTAKE: 0.331 0.562 = 14.3 mm  
Cam Timing@0.004-inch Tappet Lift:
  Open Close Adv. Duration
  EXHAUST: 84 BBDC 31 ATDC 295
  INTAKE: 8 BTDC 89 ABDC 277
Cam Timing@0.050-inch Tappet Lift:
  Open Close Duration
  EXHAUST: 56 BBDC 6 BTDC 230
  INTAKE: 18 ATDC 49 ABDC 211
PART NUMBER 12603844
LS3 CAM CARD DATA:
120 INTAKE CENTERLINE, 117.5 LOBE DISPLACEMENT ANGLE *LDA*
1.70 ROCKER RATIO
Valve Lift:      
  @Cam @Valve  
  Exhaust: 0.306 0.522 = 13.3 mm  
  Intake: 0.324 0.551 = 14.0 mm  
Cam Timing@0.004-inch Tappet Lift:
  Open Close Adv. Duration
  Exhaust: 66 BBDC 29 ATDC 275
  Intake: 7 BTDC 80 ABDC 267
Cam Timing@0.050-inch Tappet Lift:
  Open Close Duration
  Exhaust: 38 BBDC 7 BTDC 211
  Intake: 19 ATDC 43 ABDC 204
PART NUMBER 12480033
LS SERIES HOT CAM
109 INTAKE CENTERLINE 112 LDA
1.71 INTAKE ROCKER RATIO
Lift:
  @Cam @Valve  
  EXHAUST: 0.308 0.525  
  INTAKE : 0.308 0.525  
Cam Timing@0.004-inch Tappet Lift:
  Open Close Adv. Duration
  EXHAUST: 75 BBDC 32 ATDC 287
  INTAKE : 27 BTDC 71 ABDC 278
Cam Timing@0.050-inch Tappet Lift:
  Open Close Duration
  EXHAUST: 46 BBDC 0 ATDC 226
  INTAKE : 1 ATDC 39 ABDC 218
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