Mutha Thumpr Complete Hydraulic Flat Tappet Camshaft Kit Lift .510"/.495" Duration 287/305 RPM Range 2000 to 5900
InfoVehicle Info Needed
COMP CAMSPART NUMBER: 249-K11-601-4

Mutha Thumpr Complete Hydraulic Flat Tappet Camshaft Kit Lift .510"/.495" Duration 287/305 RPM Range 2000 to 5900

$74495
ShippingShips on 09/15/2026
Lowest PriceLowest Price Guarantee

Chevy 396-454ci Big Block 1965-96
    Mutha Thumpr Complete Hydraulic Flat Tappet Camshaft Kit
    Lift .510"/.495"
    Duration 287/305
    RPM Range 2000 to 5900

  • Complete Camshaft Kit
  • 3 Grinds To Fit All Of Your Performance Needs
  • Long Exhaust Duration
  • Produces A Powerful Hard-Hitting Exhaust Note
  • Excellent Horsepower Gains And Broad Torque Curve
  • Delivers Real Seat Of The Pants Performance
  • Designed For Use w/Latest In ValveTrain Components
  • 1 Year Limited Warranty

    Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572


    High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Thumpr Camshafts are the hottest cams to hit the streets in more than a decade. That's because they give you the big cam sound you're looking for, without the drawbacks. Applying a camshaft design originally created for sports car endurance racing, they incorporate early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap. Best of all, Thumprs will not negatively impact power output or streetability.

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

    Thumpr Sound ClipClick to Listen

    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.

The Comp Cams Thumpr Hydraulic Flat Tappet Cams are the perfect solution for muscle car enthusiasts and performance builders seeking that aggressive "thumpy" idle and increased engine power. Engineered to deliver impressive performance without sacrificing drivability, these camshafts are designed for vehicles that demand high-performance upgrades. Whether you're building a street rod, classic muscle car, or high-performance engine, the Thumpr camshaft is the ideal choice for anyone looking to take their ride to the next level.

The Big Mutha Thumpr cam kit is tailored for those looking for a more aggressive, lopey idle while boosting horsepower and torque. These camshafts are specifically designed to provide maximum power and enhanced throttle response, particularly at mid-range RPMs, making them a top choice for street performance builds.

The performance camshaft offers an ideal balance between street-friendly drivability and high-performance capability. With a unique lobe design, the Thumpr camshaft provides an unmistakable sound while increasing airflow and valve timing for more robust power delivery. These camshafts are perfect for enthusiasts who want to enhance both the sound and performance of their engine.

If you're seeking a camshaft that makes your engine roar with authority while delivering tangible performance gains, look no further than the Comp Cams Thumpr Hydraulic Flat Tappet Cams. Upgrade your engine today and experience the difference in power, performance, and sound!

Part TypeCamshaft Kit
Product LineComp Cams Thumpr Hydraulic Flat Tappet Cams
BrandCOMP CAMS
Package Height6.1
Package Width10.4
Package Length25.3
Weight26.57 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)249
Cam StyleHydraulic flat tappet
Grind Number287TH7
Exh. Duration Advertised (Deg)305
Locks IncludedYes
Engine Make/SizeChevy Big Block (396-454)
Retainers IncludedYes
Intake Valve Lift With Factory Rocker Arm Ratio (I0.51
Int. Duration @ .050 In. (Deg)235
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,000-5,900
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)287
Lobe Separation (Deg)107
Rpm Range2000-5900
Lifter StyleHydraulic flat tappet
Advertised Duration287 int./304 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.495
Valve Springs IncludedYes
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.510 int./0.495 exh.
QuantitySold as a kit
Valve Stem Seals IncludedYes
Exhaust Valve Lift0.495 in (12.573 mm)
Advertised Intake Duration287
Intake Duration At 050 Inch Lift235
Exhaust Duration At 050 Inch Lift249
Timing Chain StyleDouble roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration304
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift235 int./249 exh.
Valve Springs RequiredNo
Lifters IncludedYes
Vendor Part NumberK11-601-4
Package Qty1
Package TypeEA
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