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COMP Cams 51-309-4

Drag Race Hydraulic Flat Tappet Camshaft Lift: .520"/.520"

COMP Cams 51-309-4

249-51-309-4

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COMP Cams 51-309-4 Drag Race Hydraulic Flat Tappet Camshaft Lift: .520"/.520" $146.99
Drag Race Hydraulic Flat Tappet Camshaft
  • Lift:.520"/.520"
  • Duration: 276°/284°
  • RPM Range: 2000-6000

  • COMP Cams 51-309-4 Details

    Pontiac 265-455ci 1955-81

  • Specialty Camshaft
  • 1 Year Limited Warranty

  • Specifications:

    Exhaust Valve Lift (in.)
    0.52
    Intake Valve Lift (in.)
    0.520
    RPM Range
    2000-6000
    Int. Duration @ .050 in. (Deg)
    228
    Exh. Duration @ .050 in. (Deg)
    236
    Int. Duration Advertised (Deg)
    276-3
    Exh. Duration Advertised (Deg)
    284-3
    Lifter Type
    Hydraulic Flat Tappet
    Engine Make/Size
    Pontiac 265-455
    Usage
    Street/Strip
    Advertised Duration
    276 int./284 exh.
    Advertised Exhaust Duration
    284
    Advertised Intake Duration
    276
    Basic Operating RPM Range
    2,000-6,000
    Cam Style
    Hydraulic flat tappet
    Computer-Controlled Compatible
    No
    Duration at 050 inch Lift
    228 int./236 exh.
    Exhaust Duration at 050 inch Lift
    236
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.52
    Grind Number
    276AH-10
    Intake Duration at 050 inch Lift
    228
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.52
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.520 int./0.520 exh.
    Valve Springs Required
    Yes
    Lobe Separation (Deg)
    110
    Manufacturer's Part Number:
    51-309-4

    A popular street camshaft used with pre 1985s original overhead valve OEM engines, the hydraulic flat tappet cam is commonly used in up to mildly aggressive performance profiles. The flat tappet lifter has a flat appearing base (this surface is actually slightly crowned) that rides on the cam lobe face, rotating slowly within the lifter bore to promote proper oiling. Internally, the lifter features a cavity that fills with oil and a piston that is depressed by the pushrod (and valve spring). This "hydraulic chamber" provides a cushion of fluid to soften the impact on the valve train, creating room for expansion as the engine reaches operating temperature. Hydraulic flat tappet camshafts deliver quiet operation at street to mild racing engine speeds. The biggest advantage to hydraulic flat tappet lifters is that they do not require constant maintenance to ensure proper valve lash. Hydraulic flat tappet camshafts/lifters are pre-loaded at initial start-up and require little, if any, maintenance from that point forward. Flat tappet lifters can only be used once per camshaft and must be replaced due to wear patterns created by the direct contact of the cam with the lifter base.

    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.

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