Product Summary

Hydraulic Roller Tappet Camshaft Type

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    Key Specs

    Camshaft TypeHydraulic Roller Tappet
    RPM Range2200-5900
    Intake Duration (.050" Lift)235
    Exhaust Duration (.050" Lift)249
    Lobe Separation107 °
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    COMP Cams 20-601-9 Details

    COMP Cams Mutha Thumpr 291THR-7 Hydraulic Roller Camshaft for Small Block Chrysler.

    Thumpr Retro-Fit Hydraulic Roller Camshafts. Hydraulic Roller-(Mutha' Thumpr) High performance street/strip, needs 9:1 CR, 2500+ stall, intake, gears, and headers, rough idle. All COMP Cams Camshafts are manufactured to the strictest tolerances. Rigorously tested and checked for quality.

    • Three unique cam designs for each application that deliver excellent horsepower gains & broad torque curve; perfect choice for muscle cars & street rods
    • Early intake valve opening & long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note
    • Best with aftermarket converters & more rear gear

    Application

    1971-89 Chrysler 318-360
    1964-89 Plymouth 273-360
    1964-91 Dodge 273-360

    Guides & Documents

    CARB Warning

    For race/ off road use only

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    COMP Cams 20-601-9 Specifications

    KEY SPECS
    MFG. Part #20-601-9
    BrandCOMP Cams
    Camshaft TypeHydraulic Roller Tappet
    RPM Range2200-5900
    Intake Duration (.050" Lift)235
    Exhaust Duration (.050" Lift)249
    Lobe Separation107 °
    GENERAL
    Intake Valve Lift w/ Rocker Arm Ratio0.522"
    Exhaust Valve Lift w/ Rocker Arm Ratio0.509"
    Intake Duration291
    Exhaust Duration311
    Sold in QuantityEach
    Grind Number291THR7
    GTIN Code036584150961
    External Ignition Box RequiredNo
    Valve Springs RequiredYes

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