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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-GK11-602-8
Big Mutha Thumpr Retro-Fit Hydraulic Roller Camshaft, Lifters, & Gear Drive Kit Lift: .570"/.554"
$1,56095
Ships on 10/22/2026
Lowest Price Guarantee Chevy 396-454 ci Big Block 1967-96 Non-Factory Roller Block Big Mutha Thumpr
- Big Mutha Thumpr Retro-Fit Hydraulic Roller Camshaft, Lifters, & Gear Drive Kit
- Lift: .570"/.554"
- Duration: 299°/319°
- Lobe Separation Angle: 107°
- RPM Range: 2300-6100
- 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
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very 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
Part TypeCamshaft Kit
BrandCOMP CAMS
Package Height5.2
Package Width10.3
Package Length25.2
Weight22.39 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)243
Cam StyleHydraulic roller tappet
Grind Number299THR7
Exh. Duration Advertised (Deg)299
Locks IncludedNo
Engine Make/SizeChevy Big Block (396-454)
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.57
Int. Duration @ .050 In. (Deg)257
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,300-6,100
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.57 in (14.478 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)319
Lobe Separation (Deg)107
Rpm Range2500-6100
Lifter StyleHydraulic roller
Advertised Duration299 int./319 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.554
Valve Springs IncludedNo
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.570 int./0.554 exh.
Camshaft Gear Attachment3-bolt
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.554 in (14.072 mm)
Advertised Intake Duration299
Intake Duration At 050 Inch Lift243
Exhaust Duration At 050 Inch Lift257
Timing Chain StyleGears
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration319
Lifter TypeHydraulic Roller Retrofit
Duration At 050 Inch Lift243 int./257 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberGK11-602-8
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
