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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-42-600-5
Thumpr Hydraulic Flat Camshaft Lift .491"/.476" Duration 278/296 RPM Range 2000-5800
$32595
2 left in stock
Ships on Sep 14, 2026
Lowest Price GuaranteeOldsmobile 260-455 c.i. 8 cyl. 1967-1990
- Thumpr Hydraulic Flat Camshaft
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.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft
BrandCOMP CAMS
Package Height2.8
Package Width3.0
Package Length24.4
Weight10.66 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)241
Cam StyleHydraulic flat tappet
Grind Number279TH7
Exh. Duration Advertised (Deg)296
Engine Make/SizeOlds 260-455
Intake Valve Lift With Factory Rocker Arm Ratio (I0.491
Int. Duration @ .050 In. (Deg)226
Basic Operating Rpm Range2,000-5,800
Intake Valve Lift0.491 in (12.471 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)278
Lobe Separation (Deg)107
Rpm Range2000-5800
Advertised Duration278 int./296 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.476
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.491 int./0.476 exh.
QuantitySold individually
Exhaust Valve Lift0.476 in (12.09 mm)
Advertised Intake Duration278
Intake Duration At 050 Inch Lift226
Exhaust Duration At 050 Inch Lift241
Advertised Exhaust Duration296
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift226 int./241 exh.
Valve Springs RequiredYes
Vendor Part Number42-600-5
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
