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COMP Cams 12-256-4 - Comp Cams 'Xtreme Energy' Hydraulic Flat Tappet Camshafts



COMP Cams 12-256-4 - Comp Cams 'Xtreme Energy' Hydraulic Flat Tappet Camshafts
COMP Cams 12-256-4 - Comp Cams 'Xtreme Energy' Hydraulic Flat Tappet Camshafts

JEGS Part Number: 249-12-256-4

Xtreme Energy 256H Hydraulic Flat Tappet Camshaft Only
Lift .449"/.456"
Duration 256°/268°
RPM Range 1200-5200
  • Fits Applications:
  • 1977-1980
    BUICK
    1955-1996
    CHEVROLET
    1967-1988
    GMC
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COMP Cams 12-256-4 Details

Chevy 262-400ci Small Block 1987-98

  • Computer Controller

  • 1987-98 Computer Controlled
  • Best in 305 or 350 Tuned Port Injected engines

  • Comp Cams 'Xtreme Energy' Hydraulic Flat Tappet Camshafts

    The Leading Edge of Valve Train Technology

    Comp Cams Xtreme Energy series are perfect for 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 and greatest in valvetrain technology . 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 springs 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 12-256-4

    Intake Valve Lift (in.)
    0.449
    Exhaust Valve Lift (in.)
    0.456
    RPM Range
    1200-5200
    Int. Duration @ .050 in. (Deg)
    212
    Exh. Duration @ .050 in. (Deg)
    218
    Int. Duration Advertised (Deg)
    256
    Exh. Duration Advertised (Deg)
    268
    Engine Make/Size
    Chevy Small Block (262-400)
    Lifter Type
    Hydraulic Flat Tappet
    Usage
    Street/Performance
    Lobe Separation (Deg)
    112
    Advertised Duration
    256 int./268 exh.
    Advertised Exhaust Duration
    268
    Advertised Intake Duration
    256
    Basic Operating RPM Range
    1,200-5,200
    Cam Style
    Hydraulic flat tappet
    Computer-Controlled Compatible
    Yes
    Duration at 050 inch Lift
    212 int./218 exh.
    Exhaust Duration at 050 inch Lift
    218
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.456
    Grind Number
    CS XE256H-12
    Intake Duration at 050 inch Lift
    212
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.449
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.449 int./0.456 exh.
    Valve Springs Required
    Yes
    Manufacturer's Part Number:
    12-256-4
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