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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-600-20
Thumpr Hydraulic Flat Tappet Camshaft Pro-Plasma Nitrided Lift .498"/.483" Duration 279/297 RPM Range 1800 to 5600
$46895
Ships on 09/15/2026
Lowest Price GuaranteeChevy 262-400ci Small Block 1958-98
- Thumpr Hydraulic Flat Tappet Camshaft
Pro-Plasma Nitrided
Lift .498"/.483"
Duration 279/297
RPM Range 1800 to 5600
Nitrided
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10
High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping 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 Height2.9
Package Width3.4
Package Length24.2
Weight9.25 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)241
Cam StyleHydraulic flat tappet
Grind Number279TH7
Exh. Duration Advertised (Deg)297
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.479
Int. Duration @ .050 In. (Deg)227
Basic Operating Rpm Range2,000-5,800
Intake Valve Lift0.479 in (12.167 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)279
Lobe Separation (Deg)107
Rpm Range2000-5800
Advertised Duration279 int./297 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.465
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.479 int./0.465 exh.
QuantitySold individually
Exhaust Valve Lift0.465 in (11.811 mm)
Advertised Intake Duration279
Intake Duration At 050 Inch Lift227
Exhaust Duration At 050 Inch Lift241
Advertised Exhaust Duration297
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift227 int./241 exh.
Valve Springs RequiredYes
Vendor Part Number12-600-20
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
