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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-CL42-601-5
Mutha" Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Lift .500"/.486" Duration 286/304 RPM Range 2200-6100
$42795
Ships on 10/23/2026
Lowest Price GuaranteeOldsmobile 260-455 c.i. 8 cyl. 1967-1990
- Mutha' Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit
- Camshaft And Lifter Kit
- 3 Grinds To Fit All Of Your Performance Needs
- Long Exhaust Duration
- Produces A Powerful Hard-Hitting Exhaust Note
- Excellent Horsepower Gains And Broad Torque Curve
- Delivers Real Seat Of The Pants Performance
- Designed For Use w/Latest In ValveTrain Components
- 1 Year Limited Warranty
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/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Lift .500"/.486"
Duration 286/304
RPM Range 2200-6100
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.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft Kit
BrandCOMP CAMS
Package Height3.1
Package Width5.6
Package Length25.5
Weight14.99 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)249
Cam StyleHydraulic flat tappet
Grind Number287TH7
Exh. Duration Advertised (Deg)304
Locks IncludedNo
Engine Make/SizeOlds 260-455
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.5
Int. Duration @ .050 In. (Deg)234
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,200-6,100
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.5 in (12.7 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)286
Lobe Separation (Deg)107
Rpm Range2200-6100
Lifter StyleHydraulic flat tappet
Advertised Duration286 int./304 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.486
Valve Springs IncludedNo
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.500 int./0.486 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.486 in (12.344 mm)
Advertised Intake Duration286
Intake Duration At 050 Inch Lift234
Exhaust Duration At 050 Inch Lift249
Timing Chain And Gears IncludedNo
Advertised Exhaust Duration304
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift234 int./249 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberCL42-601-5
Package Qty1
Package TypeEA
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