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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-GK11-601-4
Mutha" Thumpr Hydraulic Flat Tappet Camshaft ,Lifter & Gear Drive Kit Lift .510"/.495" Duration 287/304 RPM Range 2000-5900
$69795
Ships on 09/16/2026
Lowest Price GuaranteeChevy 396-454ci Big Block 1965-96
- Mutha' Thumpr Hydraulic Flat Tappet Camshaft ,Lifter & Gear Drive Kit
- Camshaft/Lifter/Gear Drive Kit
- Precision Machined
- Heat treated Billet Steel Gears
- 3-Way Crank Sprocket
- 4 deg. Maximum Advance Or Retard
- Ready To Install Kit Incl. Bolts And Lock Plates
- Perfect Addition For Street Performance Vehicles
- 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.
Lift .510"/.495"
Duration 287/304
RPM Range 2000-5900
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.
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Part TypeCamshaft Kit
BrandCOMP CAMS
Package Height5.0
Package Width10.5
Package Length26.0
Weight21.0 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)249
Cam StyleHydraulic flat tappet
Grind Number287TH7
Exh. Duration Advertised (Deg)305
Locks IncludedNo
Engine Make/SizeChevy Big Block (396-454)
Retainers IncludedNo
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 IncludedNo
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.510 int./0.495 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
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 StyleGears
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration304
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift235 int./249 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberGK11-601-4
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
