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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-91-600-5
Thumpr Hydraulic Flat Tappet Camshaft Lift .478"/.465" Duration 279/297 RPM Range 1500-5000
$32595
Ships on 10/22/2026
Lowest Price GuaranteeBuick Nailhead 364, 401, 425, c.i. 8 CYL. 1957-1966(Classic Thumpr)
- Thumpr Hydraulic Flat Tappet Camshaft
- 3 Grinds To Fit All Of Your Performance Needs
- Unique Design
- Maximizes Sound And Mid To High RPM Power
- Ensures Safe Piston-To-Valve Clearance
- Proven To Generate 25+ RWHP Gains
- Does Not Compromise Durability
- 1 Year Limited Warranty
Buick; 361; 401; 425; Nailhead
Performance street with strong torque, stock converter ok. Choppy/thumping idle.
Lift .478"/.465"
Duration 279/297
RPM Range 1500-5000
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 Height2.75
Package Width3.0
Package Length24.5
Weight9.8 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)241
Cam StyleHydraulic flat tappet
Grind Number279TH7
Exh. Duration Advertised (Deg)297
Engine Make/SizeBuick Nailhead 264-425
Intake Valve Lift With Factory Rocker Arm Ratio (I0.478
Int. Duration @ .050 In. (Deg)227
Basic Operating Rpm Range2,000-5,800
Intake Valve Lift0.478 in (12.141 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/Performance
Valve Lift With Factory Rocker Arm Ratio0.478 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
Duration At 050 Inch Lift227 int./241 exh.
Valve Springs RequiredYes
Vendor Part Number91-600-5
Package Qty1
Package TypeEA
No Questions
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Some parts are not legal for use in California or other states with similar laws / regulations
