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COMP Cams 12-970-9

COMP Cams Comp Cams Drag Race Mechanical Roller Camshafts

249-12-970-9

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$416.99
COMP Cams Comp Cams Drag Race Mechanical Roller Camshafts $416.99
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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:

    Engine Make/Size
    Chevy Small Block (262-400)
    RPM Range
    5000-7500
    Lifter Type
    Mechanical Roller
    Int. Duration Advertised (Deg)
    312
    Exh. Duration @ .050 in. (Deg)
    286
    Exh. Duration Advertised (Deg)
    325
    Exhaust Valve Lift (in.)
    0.645
    Int. Duration @ .050 in. (Deg)
    279
    Intake Valve Lift (in.)
    0.679
    Usage
    Strip
    Quantity
    Sold individually
    Lobe Separation (Deg)
    108
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.645
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.679
    Valve Lift with Factory Rocker Arm Ratio
    0.679 int./0.645 exh.
    Advertised Duration
    312 int./325 exh.
    Computer-Controlled Compatible
    No
    Valve Springs Required
    Yes
    Cam Style
    Mechanical roller tappet
    Exhaust Duration at 050 inch Lift
    286
    Intake Duration at 050 inch Lift
    279
    Duration at 050 inch Lift
    279 int./286 exh.
    Advertised Intake Duration
    312
    Advertised Exhaust Duration
    325
    Basic Operating RPM Range
    5,000-7,500
    Grind Number
    CS 312R-8 .900 BASE CIRCLE
    Exhaust Valve Lash (in.)
    0.026
    Intake Valve Lash (in.)
    0.024
    Manufacturer's Part Number:
    12-970-9
    Shipping Weight:
    8.27
    Package Height:
    24.5
    Package Depth:
    2.7
    Package Width:
    3

    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.

  • Items You Need

    Some parts are not legal for use in California or other states with similar laws / regulations

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    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.

    Tools:

    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

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    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.