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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-GK12-600-8
Thumpr Retro-Fit Hydraulic Roller Camshaft, Lifters, & Gear Drive Kit Lift: .513"/.498"
$1,56095
Ships on 10/22/2026
Lowest Price Guarantee Chevy 262-400ci Small Block 1958-98 Non-Factory Roller BlockThumpr
- Thumpr Retro-Fit Hydraulic Roller Camshaft, Lifters, & Gear Drive Kit
- Lift: .513"/.498"
- Duration: 283°/303°
- Lobe Separation Angle: 107°
- RPM Range: 1900-5600
- 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
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.
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 Height5.3
Package Width10.2
Package Length25.4
Weight19.65 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)241
Cam StyleHydraulic roller tappet
Grind Number283T HR-107
Exh. Duration Advertised (Deg)303
Locks IncludedNo
Engine Make/SizeChevy Small Block (262-400)
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.511
Int. Duration @ .050 In. (Deg)227
Assembly Lubricant IncludedYes
Basic Operating Rpm Range1,900-5,600
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.511 in (12.979 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)283
Lobe Separation (Deg)107
Rpm Range1900-5600
Lifter StyleHydraulic roller
Advertised Duration283 int./303 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.497
Valve Springs IncludedNo
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.511 int./0.497 exh.
Camshaft Gear Attachment3-bolt
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.497 in (12.624 mm)
Advertised Intake Duration283
Intake Duration At 050 Inch Lift227
Exhaust Duration At 050 Inch Lift241
Timing Chain StyleGears
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration303
Lifter TypeHydraulic Roller Retrofit
Duration At 050 Inch Lift227 int./241 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberGK12-600-8
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
