Howards_2016_home_pg_shift.qxp_2005Howardscurrent vers .QXD4 copy 8/29/16 9:16 AM Page 112
CAMSHAFTS
CHEVROLET BIG BLOCK MARK IV Cam Part No.
120225-12 120235-10 120235-12 123515-10 120245-10 120245-12 122115-12 122115-14
123315-08 123315-10 120325-08 120325-10 120325-12 120255-08 120255-12 121905-08 121905-11
120605-12 120605-14 120205-12 120205-14 120405-08 120405-10 120405-12
Cam & Lifter Set Part No.
CL120225-12 CL120235-10 CL120235-12 CL123515-10 CL120245-10 CL120245-12 CL122115-12 CL122115-14
CL123315-08 CL123315-10 CL120325-08 CL120325-10 CL120325-12 CL120255-08 CL120255-12 CL121905-08 CL121905-11
CL120605-12
CL120605-14 CL120205-12 CL120205-14 CL120405-08 CL120405-10 CL120405-12
• 396-502 1965-1996
Duration Advertised IN EX
262
1200-4400
266
1200-5000
266
1400-4600
272
1600-5000
278
1800-5400
278
1800-5400
278
1800-5600
278
1800-5600
280
2000-5600
280
2000-5600
282
2000-5700
282
2000-5800
282
2000-5800
284
2400-6000
284
2400-6000
286
2500-6100
286
2500-6200
286
2500-6200
286
2500-6500
286
2500-6300
286
2500-6300
288
2600-6400
288
2600-6400
288
2600-6400
266
Duration @ .050” IN EX
209
213
Firing Order: 1•8•4•3•6•5•7•2
Valve Lift w/1.70 Rockers IN EX
.510
.527
Lobe Separation Intake Angle Centerline
112
Great daily usage, smooth idle, great fuel economy.
274
213
221
.510
.538
110
108 106
Good idle, Off-Road & Street Performance. 9.0:1 CR advised.
274
213
221
.510
.538
112
108
Good idle, Off-Road & Street Performance. 9.0:1 CR advised.
280
219
227
.555
.555
110
106
Valve Lash IN EX
Cam Notes
Hyd. Hyd.
1,2
Hyd. Hyd. Hyd. Hyd. Hyd. Hyd.
Good idle, Performance Street, great low to mid range. Headers suggested.
284
225
231
.567
.578
110
106
Hyd. Hyd.
Noticeable idle, Street Performance. Should have 2000+ stall, 9.5:1+ CR.
284
225
231
.567
.578
112
Fair idle, Street & mild Performance usage. Crisp throttle.
288
225
235
.595
.601
112
108 108
Hyd. Hyd. Hyd. Hyd.
Mild idle, Street Performance, Great mid range torque. Headers suggested
288
225
235
.595
.601
114
110
Hyd. Hyd.
Fair idle, excellent mid range power. 2500+ stall. Also good w/roots blower, 10psi max.
280
227
227
.555
.555
108
104
Hyd. Hyd.
Mild rough idle, Hot Street. Should have good exhaust, 2500+ stall & 9.5:1 CR.
280
227
227
.555
.555
110
106
Hyd. Hyd.
Mild rough idle, Hot Street. Should have good exhaust, 2500+ stall & 9.5:1 CR.
288
229
235
.589
.601
108
104
Street/Strip, 10.0:1+ CR, aftermarket dual plane intake recommended.
288
229
235
.589
.601
110
106
Fair idle, Performance usage. Mid-range torque & horsepower.
288
229
235
.589
.601
112
108
Hyd. Hyd.
Hyd. Hyd. Hyd. Hyd.
Fair idle, Moderate Street/Mild Bracket. Good mid range. 10.0-11.5:1, 2500+ stall.
288
231
235
.578
.618
108
104
Fair idle, Performance usage. Great mid-range torque & power.
288
231
235
.578
.618
112
108
Fair idle, Performance usage. Great mid-range torque & power.
286
233
233
.601
.601
108
104
Hyd. Hyd.
Hyd. Hyd.
Hyd. Hyd.
Rough idle, Performance Street/Mild Strip. Nice mid range. 9.5:1+ CR, 2500+ stall.
286
233
233
.601
.601
111
107
Hyd. Hyd.
Rough idle, Hot Street. Good usable mid range power band. 9.5:1+ CR, 2500+ stall.
300
233
247
.601
.612
112
108
Hyd. Hyd.
Mild idle, Hot Street. Great mid range performance. 9.5:1+ CR, 2500+ stall.
300
233
247
.601
.612
114
110
Hyd. Hyd.
Mild idle, Hot Street. Great mid range performance. Small blower or NOS OK.
298
233
245
.635
.635
112
108
Hyd. Hyd.
Fair idle, Aggressive Street. Big mid range torque. 9.5:1+ CR, 2500+ stall.
298
233
245
.635
.635
114
110
Hyd. Hyd.
Fair idle, Aggressive Street. Big mid range torque. Good with 150+ NOS or blower.
294
235
241
.618
.618
108
104
Hyd. Hyd.
Rough idle, Hot Street/Strip. Great mid range. Needs good heads, 10.0:1+ CR.
294
235
241
.618
.618
110
106
Hyd. Hyd.
Fair idle, Street/Strip, best in 496-540ci. Nice mid range power. 2600+ stall.
294
235
241
.618
.618
Rough idle, strong mid-range torque & horsepower.
112
108
Hyd. Hyd.
1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2 1,2
Cam Notes: master note list on page 260 1 2
Stock (O.E.) valve springs cannot be used. Requires Thrust Button.
112
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Fax: 1300 350 454
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