Oval Racing Camshafts For SB Chevys &RPS&DPVRIIHUVDZLGHYDULHW\RIFDPVKDIWJULQGVIRUVSHFL¿FFLUFOHWUDFNUDFLQJDSSOLFDWLRQV&RPS VPRVWSRSXODUK\GUDXOLF VROLGDQGUROOHUFDPVKDIWVDUHOLVWHG
Valve Setting
Advertised Duration
Duration @.050"
Lift With 1.5 Rockers Lobe Sep. Angle In. Ex.
Recommended Components
Camshaft Part Number
Valve Springs
Titanium Retainers
Application
In.
Ex.
In.
Ex.
In.
Ex.
Lifters
Hydraulic - Heavy Car/Short Track, Stock Valve Train, 3000-6000 RPM Hydraulic - 1/4 to 3/8 Mi. Track, Broad Torque Range, 3500-6300 RPM Hydraulic - 3/8 to 1/2 Mi. Track, 350 And Larger Engine, 3700-6500 RPM
Hyd. Hyd. COM12-325-4 280° 288° 232° 237° .483" .483" 108° COM986-16 COM740-16 COM858-16
Hyd. Hyd. COM12-330-4 286° 292° 236° 244° .490" .485" 108° COM986-16 COM740-16 COM858-16
Hyd. Hyd. COM12-344-5 296° 305° 246° 253° .510" .525" 106° COM986-16 COM740-16 COM858-16
Solid - .470" Lift Rule, Rough Idle, Low Vacuum Solid, 1/4-3/8 Tight Track, 327-358 2bbl, 9:1 Comp.
.018" .018" COM12-523-5 270° 282° 242° 250° .473" .473" 106° COM983-16 COM740-16 COM813-16
.016" .018" COM12-650-5 274° 280° 244° 246° .519" .519" 108° COM950-16 COM740-16 COM813-16 .016" .018" COM12-651-5 278° 284° 248° 250° .531" .525" 108° COM950-16 COM740-16 COM813-16 .016" .018" COM12-652-5 278° 284° 248° 250° .531" .525" 106° COM950-16 COM730-16 COM813-16 .016" .018" COM12-653-5* 282° 288° 252° 254° .540" .531" 106° COM950-16 COM730-16 COM813-16
Solid, 1/4-3/8 Fast Track 327-358 2bbl, 9:1 Comp. Solid - 1/4-3/8, 327-358 2bbl, 3000-6800 Solid - 1/4-3/8, 327-358 2bbl, 3200-7000
Solid, 1/4-3/8 Tight Track, 327-358 4bbl, 12:1 Comp.
.016" .018" COM12-656-5* 282° 292° 252° 258° .540" .537" 106° COM950-16 COM740-16 COM813-16 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, Broad Torque Range, 3500-6800 RPM .020" .022" COM12-610-5* 290° 304° 255° 266° .540" .534" 104° COM987-16 COM740-16 COM813-16 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, 360+ 4BBL, 12:1 Comp. .016" .018" COM12-659-5 294° 304° 264° 270° .567" .555" 106° COM950-16 COM740-16 COM813-16
Roller - 1/4-3/8 Mi. Track, Tight Corners, 3500-6500
.020" .022" COM12-901-9 † 292° 296° 256° 258° .630" .630" 106° COM943-16 COM731-16 COM818-16
Roller - 1/4-1/2 Mile Track, 355-377 4BBL Late Model, Big Heads Roller - 1/4-3/8 Mi. Track, 355, Late Model, 3000-7000 Roller - ARCA 358, 6200-8500
.016" .016" COM12-857-9 † 283° 287° 255° 259° .645" .645" 106° COM26089-16 COM731-16 COM818-16
.020" .022" COM12-940-9 † 290° 300° 260° 264° .645" .630" 106° COM943-16 COM731-16 COM818-16 .020" .022" COM12-906-9 † 312° 322° 276° 284° .630" .630" 107° COM943-16 COM731-16 COM818-16
Roller - .900" Base Circle 383-415 cu. in., Late Model, Mod., 3400-7600 RPM .016" .020" COM12-861-9 † 287° 300° 259° 268° .648" .645" 107° COM26089-16 COM731-16 COM891-16 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 358 C.I., Open Carb,6200-8500 RPM .020" .022" COM12-996-9 † 312° 322° 276° 284° .630" .630" 107° COM943-16 COM731-16 COM891-16 † 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. 1RGP9JGGN/QFKƂGF6TCEVKQP%QPVTQN%COUJCHVU(QT5$%JGX[U
2SHQ:KHHO0RGL¿HG7&FDPVKDIWVDUHHQJLQHHUHGVSHFL¿FDOO\ WRGHOLYHURXWVWDQGLQJKRUVHSRZHULQDEURDGUDQJHZKLOHPLQLPL] LQJWLUHVSLQHIIHFWLYHO\FUHDWLQJOHJDOWUDFWLRQFRQWURO
Valve Setting
Advertised Duration
Duration @.050"
Lift With 1.6 Rockers Lobe Sep. Angle In. Ex.
Recommended Components
Camshaft Part Number
Valve Springs
Titanium Retainers
Application
In.
Ex.
In.
Ex.
In.
Ex.
Lifters
Solid - IMCA Std. Rocker Ratio, 3/8 - 5/8 Tracks, 355+ cu. in. 12:1 Comp., 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., 3200-7500 RPM Roller - Outlaw Mod./LLM 4&7 Swap 1/3 - 1/2 Tracks, 355-383 cu. in. 11:1 Comp., 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. Roller, 3/8-5/8 Track, 355-383 4bbl., 12:1 Comp.
.016" .018" COM12-527-5 284° 293° 258° 264° .597" .606" 107° COM950-16 COM732-16 COM813-16
.016" .018" COM12-780-9 † 287° 291° 256° 260° .589" .589" 107° COM943-16 COM731-16 COM818-16
.016" .018" COM12-840-14 † 285° 294° 256° 261° .702" .691" 107° COM943-16 COM731-16 COM818-16
.016" .018" COM12-841-14 † 289° 298° 260° 265° .709" .694" 107° .016" .018" COM12-842-14 † 293° 302° 264° 269° .715" .698" 107°
— COM738-16 — COM738-16
— —
† Requires upgraded gear, thrust button, and wear plate.
270 2019-20 CIRCLE TRACK PARTS AND ACCESSORIES
Made with FlippingBook flipbook maker