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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-602-20
Big Mutha" Thumpr Hydraulic Flat Tappet Camshaft Pro-Plasma Nitrided Lift .498"/.483" Duration 279/296 RPM Range 1800 to 5600
$42295
Ships on Sep 04, 2026
Lowest Price GuaranteeChevy 396-454ci Big Block 1965-96
- Big Mutha' Thumpr Hydraulic Flat Tappet Camshaft
Pro-Plasma Nitrided
Lift .498"/.483"
Duration 279/296
RPM Range 1800 to 5600
HYDRAULIC - Big Mutha' Thumpr™ - Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.
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. Nitrided.
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
BrandCOMP CAMS
Package Height2.75
Package Width3.0
Package Length24.5
Weight10.22 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)257
Cam StyleHydraulic flat tappet
Grind Number295TH7
Exh. Duration Advertised (Deg)312
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.522
Int. Duration @ .050 In. (Deg)243
Basic Operating Rpm Range2,300-6,200
Intake Valve Lift0.522 in (13.259 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)295
Lobe Separation (Deg)107
Rpm Range2300-6200
Advertised Duration295 int./312 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.507
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.522 int./0.507 exh.
QuantitySold individually
Exhaust Valve Lift0.507 in (12.878 mm)
Advertised Intake Duration295
Intake Duration At 050 Inch Lift243
Exhaust Duration At 050 Inch Lift257
Advertised Exhaust Duration312
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift243 int./257 exh.
Valve Springs RequiredYes
Vendor Part Number11-602-20
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
