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COMP Cams 12-970-9

Comp Cams Drag Race Mechanical Roller Camshafts

COMP Cams 12-970-9

249-12-970-9

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COMP Cams 12-970-9 Comp Cams Drag Race Mechanical Roller Camshafts $330.99
Bracket Race - Small Base Circle, .900''
Drag Race 312R-8 Mechanical Roller Camshaft Only
Lift: .679''/.645''
Duration: 312°/325°
RPM Range: 5000-7500

COMP Cams 12-970-9 Details

Chevy 262-400ci Small Block 1955-98

  • (.900" Base Circle)

    *Note: In order to use these camshafts in 1955-57 265ci blocks, it is necessary to machine a small 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.

    400+ ci, good cylinder heads, high compression, .900'' base circle for stroker clearances.

    Operating Range:5000-7500 RPM
    Duration Advertised:312° Intake / 325° Exhaust
    Duration @ .050'' Lift:279° Intake / 286° Exhaust
    Valve Lift w/1.5 Rockers:.679'' Intake / .645'' Exhaust
    Valve Setting:.024'' Intake / .026'' Exhaust
    Lobe Separation Angle:108°

  • Specifications:

    Exhaust Valve Lift (in.)
    0.645
    Intake Valve Lift (in.)
    0.679
    Int. Duration @ .050 in. (Deg)
    279
    Exh. Duration @ .050 in. (Deg)
    286
    Int. Duration Advertised (Deg)
    312
    Exh. Duration Advertised (Deg)
    325
    RPM Range
    5000-7500
    Engine Make/Size
    Chevy Small Block (262-400)
    Lifter Type
    Mechanical Roller
    Usage
    Strip
    Advertised Duration
    312 int./325 exh.
    Advertised Exhaust Duration
    325
    Advertised Intake Duration
    312
    Basic Operating RPM Range
    5,000-7,500
    Cam Style
    Mechanical roller tappet
    Computer-Controlled Compatible
    No
    Duration at 050 inch Lift
    279 int./286 exh.
    Exhaust Duration at 050 inch Lift
    286
    Exhaust Valve Lash (in.)
    0.026
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.645
    Grind Number
    CS 312R-8 .900 BASE CIRCLE
    Intake Duration at 050 inch Lift
    279
    Intake Valve Lash (in.)
    0.024
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.679
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.679 int./0.645 exh.
    Valve Springs Required
    Yes
    Lobe Separation (Deg)
    108
    Manufacturer's Part Number:
    12-970-9

    Roller Cam For On Demand Power

    Camshafts specifically designed for use in all ''Super'' catagory cars, especially those equipped with throttle stops. These powerful Comp Cams offer crisp, immediate throttle response and excellent repeatability, plus are relatively easy on valve train parts.

    Features:
  • Wide assortment of racing camshafts for all application requirements of drag, oval track and puller & mud competitors
  • Require accurate assessment of rear end gearing and other vehicle-based equipment to deliver top performance
  • Not made for street use or vehicles requiring accessory drive equipment, such as power brakes, air conditioning, etc.

    Small Kits are indicated by a SK in their part number and include Camshaft, Lifters, Timing Chain Set, Assembly Lube, Decals, and Instructions.

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