COMP Cams Drag Race Mechanical Roller Camshaft Lift .748"/.748" Duration 321/336 RPM Range 5000-7500
249-11-740-9
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Chevy 396-454ci Big Block 1965-96
*Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16'' wide x 7/64'' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine.** Note: Requires upgraded gear, thrust button & wear plate.
Super Comp, 5000 stall converter, 500+ ci
Operating Range: 5000-7500 RPM Duration Advertised: 321° Intake / 336° Exhaust Duration @ .050'' Lift: 286° Intake / 298° Exhaust Valve Lift w/1.7 Rockers: .748'' Intake / .748'' Exhaust Valve Setting: .028'' Intake / .030'' Exhaust Lobe Separation Angle: 112° Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Super Comp. 5000+ stall, 500+c.i.Specifications:
Part TypeAdvertised Duration321 int./336 exh.Advertised Exhaust Duration336Advertised Intake Duration321Basic Operating RPM Range5,000-7,500Cam StyleMechanical roller tappetComputer-Controlled CompatibleNoDuration at 050 inch Lift286 int./298 exh.Engine Make/SizeChevy Big Block (396-454)Exh. Duration @ .050 in. (Deg)298Exh. Duration Advertised (Deg)336-5Exhaust Duration at 050 inch Lift298Exhaust Valve Lash0.03 in (0.762 mm)Exhaust Valve Lift0.748 in (18.999 mm)Exhaust Valve Lift with Factory Rocker Arm Ratio (0.748Grind NumberCB 321JR-12Int. Duration @ .050 in. (Deg)286Int. Duration Advertised (Deg)321-4Intake Duration at 050 inch Lift286Intake Valve Lash0.028 in (0.711 mm)Intake Valve Lift0.748 in (18.999 mm)Intake Valve Lift with Factory Rocker Arm Ratio (i0.748Lifter TypeMechanical RollerLobe Separation (Deg)112Package Depth24.30Package Height2.80Package Width3.00Part CategoryPerformance PartsPart FitmentSemi UniversalQuantitySold individuallyRPM Range5000-7500Shipping Weight10.53UsageStripValve Lift with Factory Rocker Arm Ratio0.748 int./0.748 exh.Valve Springs RequiredYesVendor Part Number11-740-9 - Overview
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