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COMP Cams 12-473-44 - Comp Cams 4-Pattern Camshafts



COMP Cams 12-473-44 - Comp Cams 4-Pattern Camshafts

Part Number: 249-12-473-44

4-Pattern .900" Base Circle Retro-Fit Hydraulic Roller Camshaft
Small Block Chevy
Intake Lift: .637"/.635"
Exhaust Lift: .621"/.621"
Lobe Separation Angle: 109.5°/108.5°
RPM Range: 2400-6700
$751.99

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COMP Cams 12-473-44 - Comp Cams 4-Pattern Camshafts Details

Small Block Chevy 262-400ci 1955-98

  • .900" Base Circle Retro-Fit

    Intake Duration: 289°/287°
    Exhaust Duration: 301°/299°

    Best choice for street 383 c.i. stroker engines with good cylinder heads. Very wide power range. 2600+ stall.

  • Specifications:

    Exhaust Valve Lift (in.)
    0.621
    Intake Valve Lift (in.)
    0.637
    Int. Duration @ .050 in. (Deg)
    236
    Exh. Duration @ .050 in. (Deg)
    246
    Int. Duration Advertised (Deg)
    289
    Exh. Duration Advertised (Deg)
    301
    Engine Make/Size
    Chevy Small Block (262-400)
    Lifter Type
    Hydraulic Roller Retrofit
    Usage
    Street/Strip
    RPM Range
    2400-6700
    Advertised Duration
    289 int./301 exh., 287 int./299 exh.
    Advertised Exhaust Duration
    301/299
    Advertised Intake Duration
    289/287
    Basic Operating RPM Range
    2,400-6,700
    Cam Style
    Hydraulic roller tappet
    Camshaft Gear Attachment
    3-bolt
    Computer-Controlled Compatible
    No
    Duration at 050 inch Lift
    236 int./246 exh., 234 int./244 exh.
    Exhaust Duration at 050 inch Lift
    246/244
    Exhaust Valve Lift with Factory Rocker Arm Ratio (
    0.621/0.621
    Grind Number
    287QS9
    Intake Duration at 050 inch Lift
    236/234
    Intake Valve Lift with Factory Rocker Arm Ratio (i
    0.637/0.635
    Quantity
    Sold individually
    Valve Lift with Factory Rocker Arm Ratio
    0.637 int./0.621 exh., 0.635 int./0.621 exh.
    Valve Springs Required
    Yes
    Lobe Separation (Deg)
    109.5/108.5
    Manufacturer's Part Number:
    12-473-44

    Comp Cams 4-Pattern Camshafts are hydraulic rollers designed to optimize valve events based on runner length and feature a large increase in both area under the curve and stability at high RPM

    To make the most power from your engine, you need to optimize the air ingested and captured by avoiding valves closing too soon or too late. Any conventional center layout single throttle body or carbureted V8 intake manifold features longer outboard runners and shorter inboard runners, meaning that each valve event should occur at a different moment.

    COMP Cams 4-Pattern Camshafts are the very first series of cams designed to accommodate this difference in length and avoid valves closing at the wrong times. NASCAR teams have been using camshafts designed this way for years, and using lessons learned along with them, COMP Cams has designed a series of cams that optimizes valve events and features a large increase in both area under the curve and stability at high RPM.

    The camshafts feature four different lobe patterns with one intake and exhaust design for outboard runners, and another intake and exhaust design for the inboard runners. While the four inboard cylinders are all the same grinds, the outboard exhaust openings are two degrees earlier, with outboard intake closings coming two degrees later. This is the first ever use of technology in street vehicles to balance air/fuel ratio per cylinder and can net you a possible 1000+ RPM over other hydraulic rollers and anywhere from 5-20+ horsepower peak to peak, depending on cylinder head flow.

    The 4-Pattern hydraulic roller cams are CNC-Machined from steel billet cores with cast iron distributor drive gears. The cams also feature a tight lobe separation for both excellent performance and a throaty sound.

    Note: Upgraded valve train components and aftermarket cylinder heads required.

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