The baseline engine with stock everything.
96 hp @ 4000 rpm 136 ft and lbs. or torque @ 3000 rpm.
That same baseline engine with just a camshaft change
PART # 52-115-4
GRIND NUMBER: P4 240H-8
ENGINE: PONTIAC 4 CYL 151
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .455 .455
.006 TAPPET LIFT 240 248
VALVE TIMING OPEN CLOSE
AT .006 INT 12 BTDC 48 ABDC
EXH 52 BBDC 16 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 108 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 192 200
LOBE LIFT .2600 .2600
LOBE SEPARATION 108
102 hp @ 4000-4500 rpm and 148 ft. lbs. of torque @ 3000 rpm
PART # 52-119-4
GRIND NUMBER: P4 252H-10
ENGINE: PONTIAC 4 CYL 151
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .474 .474
.006 TAPPET LIFT 252 252
VALVE TIMING OPEN CLOSE
AT .006 INT 20 BTDC 52 ABDC
EXH 60 BBDC 12 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 106 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 206 206
LOBE LIFT .2706 .2706
LOBE SEPARATION 110
101 hp @ 4000 rpm and 146 ft. lbs. of torque @ 3000 rpm
PART # 52-123-4
GRIND NUMBER: P4 260H-10
ENGINE: PONTIAC 4 CYL 151
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .489 .489
.006 TAPPET LIFT 260 260
VALVE TIMING OPEN CLOSE
AT .006 INT 24 BTDC 56 ABDC
EXH 64 BBDC 16 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 106 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 212 212
LOBE LIFT .2795 .2795
LOBE SEPARATION 110
108 hp @ 4500 rpm and 144 ft lbs. of torque @ 3000-3500 rpm
PART # 52-500-5
GRIND NUMBER: P4 272TL-5
ENGINE: PONTIAC 4 CYL 151
INTAKE EXHAUST
VALVE ADJUSTMENT .022 .024
GROSS VALVE LIFT .595 .595
.020 TAPPET LIFT 272 272
VALVE TIMING OPEN CLOSE
AT .020 INT 31 BTDC 61 ABDC
EXH 61 BBDC 31 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 105 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 242 242
LOBE LIFT .3400 .3400
LOBE SEPARATION 105
THIS CAM SHOULD USE SPRING # 987-8
118 hp @ 5000 rpm and 136 ft. lbs. of torque @ 4000 rpm.
PART # 52-502-5
GRIND NUMBER: P4 276TL-5
ENGINE: PONTIAC 4 CYL 151
INTAKE EXHAUST
VALVE ADJUSTMENT .022 .024
GROSS VALVE LIFT .606 .606
.018 TAPPET LIFT 276 276
VALVE TIMING OPEN CLOSE
AT .018 INT 33 BTDC 63 ABDC
EXH 63 BBDC 33 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 105 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 246 246
LOBE LIFT .3467 .3467
LOBE SEPARATION 105
THIS CAM SHOULD USE SPRING # 987-8
117 hp @ 5000-5500 rpm and 133 ft. lbs. of torque @ 4000 rpm.
Here are the dynos I got starting with the baseline stock motor so you
have something to compare the gains too.
Stock motor.
96 hp @ 4000 rpm & 136 ft. lbs. of torque @ 3000 rpm.
Stock motor with just headers.
113 hp @ 4000 rpm & 153 ft. lbs. of torque @ 3500 rpm
Stock motor with header and ported heads.
132 hp @ 5000 rpm & 159 ft. lbs. of torque @ 3500-4000 rpm.
Stock motor with just Lunati cam.
139 hp @ 5500 rpm & 143 ft. lbs. of torque @ 4500 rpm.
Lunati cam with headers and nothing else.
164 hp @ 5500 rpm & 167 ft. lbs. of torque @ 4500 rpm
Lunati cam with headers & ported heads.
192 hp @ 6500 rpm & 177 ft. lbs. of torque @ 5000 rpm with not bottom-end
power.
You will need an iron duke with a stronger block and bottom end to sustain
those kinds of figures especially if you want to rev it, probably super
duty duke parts$$$$
All these dynos assume perfect air, spark, and fuel ratios for any given
combination
