Page 274 - 2019-2020 Racecar Engineering Circle Track Parts and Accessories Catalog

Oval Racing Camshafts For SB Chevys
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Valve Advertised Duration Lift With
Setting Duration @.050" 1.5 Rockers Lobe Recommended Components
Camshaft Sep. Valve Titanium
Application In. Ex. Part Number In. Ex. In. Ex. In. Ex. Angle Springs Retainers Lifters
Hydraulic - Heavy Car/Short Track,
Stock Valve Train, 3000-6000 RPM Hyd. Hyd. COM12-325-4 280° 288° 232° 237° .483" .483" 108° COM986-16 COM740-16 COM858-16
Hydraulic - 1/4 to 3/8 Mi. Track, Hyd. Hyd. COM12-330-4 286° 292° 236° 244° .490" .485" 108° COM986-16 COM740-16 COM858-16
Broad Torque Range, 3500-6300 RPM
Hydraulic - 3/8 to 1/2 Mi. Track, Hyd. Hyd. COM12-344-5 296° 305° 246° 253° .510" .525" 106° COM986-16 COM740-16 COM858-16
350 And Larger Engine, 3700-6500 RPM
Solid - .470" Lift Rule,
Rough Idle, Low Vacuum .018" .018" COM12-523-5 270° 282° 242° 250° .473" .473" 106° COM983-16 COM740-16 COM813-16
Solid, 1/4-3/8 Tight Track, .016" .018" COM12-650-5 274° 280° 244° 246° .519" .519" 108° COM950-16 COM740-16 COM813-16
327-358 2bbl, 9:1 Comp.
Solid, 1/4-3/8 Fast Track 327-358 2bbl, 9:1 Comp. .016" .018" COM12-651-5 278° 284° 248° 250° .531" .525" 108° COM950-16 COM740-16 COM813-16
Solid - 1/4-3/8, 327-358 2bbl, 3000-6800 .016" .018" COM12-652-5 278° 284° 248° 250° .531" .525" 106° COM950-16 COM730-16 COM813-16
Solid - 1/4-3/8, 327-358 2bbl, 3200-7000 .016" .018" COM12-653-5* 282° 288° 252° 254° .540" .531" 106° COM950-16 COM730-16 COM813-16
Solid, 1/4-3/8 Tight Track, .016" .018" COM12-656-5* 282° 292° 252° 258° .540" .537" 106° COM950-16 COM740-16 COM813-16
327-358 4bbl, 12:1 Comp.
Solid, Late Model Stock, 1/4-3/8 Track, 358 Limited .016" .018" COM12-654-5* 286° 292° 256° 258° .549" .537" 108° COM950-16 COM740-16 COM813-16
Solid - 1/4 to 3/8 Mi. Track,
Good All-Around Cam, 3000-6500 RPM .020" .022" COM12-609-5* 285° 295° 250° 260° .532" .555" 106° COM987-16 COM740-16 COM813-16
Solid - 3/8-1/2, 358+, 3400-7400 .016" .018" COM12-655-5 290° 296° 256° 262° .558" .543" 108° COM950-16 COM730-16 COM813-16
Solid - Fast 1/4 to 3/8 Mi. Track, .020" .022" COM12-610-5* 290° 304° 255° 266° .540" .534" 104° COM987-16 COM740-16 COM813-16
Broad Torque Range, 3500-6800 RPM
Solid - Fast Cornered 1/4 to 3/8 Mi. Track, Good Top End,
3700-7000 RPM .020" .022" COM12-611-5* 290° 304° 255° 266° .540" .534" 106° COM987-16 COM740-16 COM813-16
360+ Solid, 3/8-1/2 Tight Track, 4bbl, 12:1+ Comp. .016" .018" COM12-658-5 290° 300° 260° 266° .558" .549" 106° COM950-16 COM740-16 COM813-16
Solid - 3/8- 1/2 Fast Track, .016" .018" COM12-659-5 294° 304° 264° 270° .567" .555" 106° COM950-16 COM740-16 COM813-16
360+ 4BBL, 12:1 Comp.
Roller - 1/4-3/8 Mi. Track, .020" .022" COM12-901-9 292° 296° 256° 258° .630" .630" 106° COM943-16 COM731-16 COM818-16
†
Tight Corners, 3500-6500
Roller - 1/4-1/2 Mile Track, 355-377
†
4BBL Late Model, Big Heads .016" .016" COM12-857-9 283° 287° 255° 259° .645" .645" 106° COM26089-16 COM731-16 COM818-16
Roller - 1/4-3/8 Mi. Track, †
355, Late Model, 3000-7000 .020" .022" COM12-940-9 290° 300° 260° 264° .645" .630" 106° COM943-16 COM731-16 COM818-16
Roller - ARCA 358, 6200-8500 .020" .022" COM12-906-9 312° 322° 276° 284° .630" .630" 107° COM943-16 COM731-16 COM818-16
†
Roller - .900" Base Circle .016" .020" COM12-861-9 287° 300° 259° 268° .648" .645" 107° COM26089-16 COM731-16 COM891-16
†
383-415 cu. in., Late Model, Mod., 3400-7600 RPM
Roller - .900" Base Circle
†
415-430 cu. in., Great Bottom End, 3400-7600 RPM .016" .020" COM12-863-9 291° 304° 263° 272° .648" .645" 108° COM26089-16 COM731-16 COM891-16
Roller - .900" Base Circle †
Late Model, Lg. Engine, Slick Track, 4500-7500 RPM .020" .022" COM12-890-9 292° 308° 264° 272° .660" .630" 106° COM943-16 COM731-16 COM891-16
Roller-.900" Base Circle .020" .022" COM12-996-9 312° 322° 276° 284° .630" .630" 107° COM943-16 COM731-16 COM891-16
†
358 C.I., Open Carb,6200-8500 RPM
† Requires upgraded gear, thrust button, and wear plate.
* Signifies camshaft also available nitrided for added durability. Simply replace “-5” suffix in part number with “-20”. Example: COM12-611-20.
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Valve Advertised Duration Lift With
Setting Duration @.050" 1.6 Rockers Lobe Recommended Components
Camshaft Sep. Valve Titanium
Application In. Ex. Part Number In. Ex. In. Ex. In. Ex. Angle Springs Retainers Lifters
Solid - IMCA Std. Rocker Ratio, 3/8 - 5/8 Tracks,
355+ cu. in. 12:1 Comp., .016" .018" COM12-527-5 284° 293° 258° 264° .597" .606" 107° COM950-16 COM732-16 COM813-16
Gas or Alcohol 4bbl. 3300-7300 RPM
Roller - Outlaw Modified, 3/8 - 5/8 Tracks,
355+ cu. in. 12:1 Comp., Gas or Alcohol 2/4bbl., .016" .018" COM12-780-9 † 287° 291° 256° 260° .589" .589" 107° COM943-16 COM731-16 COM818-16
3200-7500 RPM
Roller - Outlaw Mod./LLM 4&7 Swap 1/3 - 1/2 Tracks,
355-383 cu. in. 11:1 Comp., .016" .018" COM12-840-14 † 285° 294° 256° 261° .702" .691" 107° COM943-16 COM731-16 COM818-16
Gas Or Alcohol 4bbl. 3600-7400 RPM
4 & 7 Firing Order Swap Applications
Roller, 1/3-1/2 Track, 355-383 4bbl., 11:1 Comp. .016" .018" COM12-841-14 † 289° 298° 260° 265° .709" .694" 107° — COM738-16 —
Roller, 3/8-5/8 Track, 355-383 4bbl., 12:1 Comp. .016" .018" COM12-842-14 † 293° 302° 264° 269° .715" .698" 107° — COM738-16 —
† Requires upgraded gear, thrust button, and wear plate.
270 2019-20 CIRCLE TRACK PARTS AND ACCESSORIES