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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-CL42-600-5
Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Lift .491"/.476" Duration 278/296 RPM Range 2000-5800
$44895
Ships on 09/15/2026
Lowest Price GuaranteeOldsmobile 260-455 c.i. 8 cyl. 1967-1990
- Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit
Lift .491"/.476"
Duration 278/296
RPM Range 2000-5800
Thumpr™ : High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.
Olds; Oldsmobile; Cutlass; Cutlass Supreme; 98; Calais; Ciera; Custom Cruiser; Starfire; Firenza; 88; Rocket; Rocket 88; Vista Cruiser; Delta 88; 260; 442; 307; 350; 403; 400; 425; 455
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 Height3.2
Package Width5.6
Package Length25.4
Weight15.2 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)241
Cam StyleHydraulic flat tappet
Grind Number279TH7
Exh. Duration Advertised (Deg)296
Locks IncludedNo
Engine Make/SizeOlds 260-455
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.491
Int. Duration @ .050 In. (Deg)226
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,000-5,800
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.491 in (12.471 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)278
Lobe Separation (Deg)107
Rpm Range2000-5800
Lifter StyleHydraulic flat tappet
Advertised Duration278 int./296 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.476
Valve Springs IncludedNo
UsageStreet/Hi-Performance
Valve Lift With Factory Rocker Arm Ratio0.491 int./0.476 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.476 in (12.09 mm)
Advertised Intake Duration278
Intake Duration At 050 Inch Lift226
Exhaust Duration At 050 Inch Lift241
Timing Chain And Gears IncludedNo
Advertised Exhaust Duration296
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift226 int./241 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberCL42-600-5
Package Qty1
Package TypeEA
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