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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-600-20
Thumpr Hydraulic Flat Tappet Camshaft Pro-Plasma Nitrided Lift .498"/.483" Duration 279/296 RPM Range 1800 to 5600
$42295
Ships on 09/15/2026
Lowest Price GuaranteeChevy 396-454ci Big Block 1965-96
- Thumpr Hydraulic Flat Tappet Camshaft
- Nitrided
- High-performance street
- Stock converter OK, best with 2000+ converter and gears
- Choppy/thumping 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
High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle. Nitrided.
Pro-Plasma Nitrided
Lift .498"/.483"
Duration 279/296
RPM Range 1800 to 5600
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)241
Cam StyleHydraulic flat tappet
Grind Number279TH7
Exh. Duration Advertised (Deg)296
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.498
Int. Duration @ .050 In. (Deg)227
Basic Operating Rpm Range1,800-5,600
Intake Valve Lift0.498 in (12.649 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)279
Lobe Separation (Deg)107
Rpm Range1800-5600
Advertised Duration279 int./296 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.483
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.498 int./0.483 exh.
QuantitySold individually
Exhaust Valve Lift0.483 in (12.268 mm)
Advertised Intake Duration279
Intake Duration At 050 Inch Lift227
Exhaust Duration At 050 Inch Lift241
Advertised Exhaust Duration296
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift227 int./241 exh.
Valve Springs RequiredYes
Vendor Part Number11-600-20
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
