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COMP Cams 12-677-4 - Comp Cams 'Xtreme Energy' Mechanical Flat Tappet Camshafts



COMP Cams 12-677-4 - Comp Cams 'Xtreme Energy' Mechanical Flat Tappet Camshafts
COMP Cams 12-677-4 - Comp Cams 'Xtreme Energy' Mechanical Flat Tappet Camshafts
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JEGS Part Number: 249-12-677-4

Xtreme Energy Mechanical Flat Camshaft
  • Lift: .501"/.510"
  • Duration: 274°/280°
  • Lobe Separation Angle: 110°
  • RPM Range 2000-6400
    • Fits Applications:
    • 1977-1980
      BUICK
      1955-1986
      CHEVROLET
      1967-1988
      GMC
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    COMP Cams 12-677-4 Details

    Chevy Small Block 265-400ci 1955-98

  • Produces Better Throttle Response
  • Produces Top Engine Horsepower
  • Delivers Increased Engine Vacuum
  • 1 Year Limited Warranty

  • Comp Cams 'Xtreme Energy' Mechanical Flat Tappet Camshafts

    The Leading Edge of Valve Train Technology

    Comp Cams Xtreme Energy series can be used in any street or street/strip application where both throttle response and top-end horsepower is desired. These camshafts are designed to take advantage of the latest improvements in valve train components and the newest developments in camshaft design. Their aggressive lobe design produces better throttle response and top end horsepower than other cams with the same duration @ .050'' lift, while delivering increased engine vacuum. We do not recommend the use of stock valve train components with these camshafts due to the aggressive lobe designs.

    Features:
  • Quicker opening lobe profiles deliver increased responsiveness & more area under the lift curve
  • More vacuum allows an increase in duration for improved performance and assists power brakes
  • Excellent performance in street carbureted applications
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios

    Camshaft & Lifter Kits are indicated by a CL in their part number and include Camshaft, Lifters, Assembly Lube, Decals, and Instructions Complete Kits are indicated by a K in their part number and include Camshaft, Lifters, Timing Chain & Gears, Valve Springs, Retainers, Locks, Assembly Lube, Decals, and Instructions.

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

  • COMP Cams 12-677-4

    Intake Valve Lift (in.)
    0.501
    Exhaust Valve Lift (in.)
    0.51
    RPM Range
    2000-6400
    Int. Duration @ .050 in. (Deg)
    236
    Exh. Duration @ .050 in. (Deg)
    242
    Int. Duration Advertised (Deg)
    274
    Exh. Duration Advertised (Deg)
    280
    Engine Make/Size
    Chevy Small Block (262-400)
    Lifter Type
    Mechanical Flat Tappet
    Usage
    Street/Performance
    Advertised Duration
    274 int./280 exh.
    Advertised Exhaust Duration
    280
    Advertised Intake Duration
    274
    Basic Operating RPM Range
    2,000-6,400
    Cam Style
    Mechanical flat tappet
    Computer-Controlled Compatible
    No
    Duration at 050 inch Lift
    236 int./242 exh.
    Exhaust Duration at 050 inch Lift
    242
    Exhaust Valve Lash (in.)
    0.016
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.51
    Grind Number
    CS XS274S-10
    Intake Duration at 050 inch Lift
    236
    Intake Valve Lash (in.)
    0.016
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.501
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.501 int./0.510 exh.
    Valve Springs Required
    Yes
    Lobe Separation (Deg)
    110
    Manufacturer's Part Number:
    12-677-4
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