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COMP Cams 11-771-8 - Comp Cams 'Xtreme Energy' Mechanical Roller Camshafts



COMP Cams 11-771-8 - Comp Cams 'Xtreme Energy' Mechanical Roller Camshafts
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Part Number: 249-11-771-8

Xtreme Energy Mechanical Roller Camshaft
Big Block Chevy 1965-96
  • Lift: .646"/.653"
  • Duration: 280°/286°
  • Lobe Separation Angle: 110°
  • RPM Range: 2500-6500
  • $280.75

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    COMP Cams 11-771-8 - Comp Cams 'Xtreme Energy' Mechanical Roller Camshafts Details

    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 thrust button & wear plate.

    Best in street machines with 2800+ stall converter, 10:1 or more compression with 3.73-3.90 gears.

    Operating Range:2500-6500 RPM
    Duration Advertised:280° Intake / 286° Exhaust
    Duration @ .050'' Lift:242° Intake / 248° Exhaust
    Valve Lift w/1.7 Rockers:.646'' Intake / .653'' Exhaust
    Valve Setting:.016'' Intake / .018'' Exhaust
    Lobe Separation Angle:110°

    Specifications:

    Intake Valve Lift (in.)
    0.646
    Exhaust Valve Lift (in.)
    0.653
    Int. Duration @ .050 in. (Deg)
    242
    Exh. Duration @ .050 in. (Deg)
    248
    RPM Range
    2500-6500
    Int. Duration Advertised (Deg)
    280
    Exh. Duration Advertised (Deg)
    286
    Engine Make/Size
    Chevy Big Block (396-454)
    Lifter Type
    Mechanical Roller
    Usage
    Street/Performance
    Advertised Duration
    280 int./286 exh.
    Advertised Exhaust Duration
    286
    Advertised Intake Duration
    280
    Basic Operating RPM Range
    2,500-6,500
    Cam Style
    Mechanical roller tappet
    Computer-Controlled Compatible
    No
    Duration at 050 inch Lift
    242 int./248 exh.
    Exhaust Duration at 050 inch Lift
    248
    Exhaust Valve Lash (in.)
    0.018
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.653
    Grind Number
    CB XR280 R-10
    Intake Duration at 050 inch Lift
    242
    Intake Valve Lash (in.)
    0.016
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.646
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.646 int./0.653 exh.
    Valve Springs Required
    Yes
    Lobe Separation (Deg)
    110
    Manufacturer's Part Number:
    11-771-8

    The Leading Edge of Valve Train Technology

    Comp Cams Xtreme Energy series camshafts can be used in any street or street/strip application where both throttle response and top-end horsepower is desired. These cams 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.

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