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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-SK11-423-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$1,30995
Ships on 10/19/2026
Lowest Price GuaranteeChevrolet Big Block 396-454 c.i. 8 CYL. 1965-1996
- Xtreme Energy Retro-Fit XR276HR Hydraulic Roller Camshaft Small Kit
- Great for Street Machines, needs intake, headers, stall, and gears.
Installation Notes:
- Stock springs cannot be used
- Requires thrust button & wear plate
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Great for street machines, needs intake, headers, 2000+ stall and gears.
Lift: .510"/.510"
Duration: 276/282
Lobe Separation Angle: 110°
RPM Range: 1900-5600
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 Height5.0
Package Width10.5
Package Length26.0
Weight22.0 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic roller tappet
Grind NumberXR276HR
Exh. Duration Advertised (Deg)282
Locks IncludedNo
Engine Make/SizeChevy Big Block (396-454)
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.51
Int. Duration @ .050 In. (Deg)224
Assembly Lubricant IncludedNo
Basic Operating Rpm Range1,900-5,600
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)276
Lobe Separation (Deg)110
Rpm Range1900-5600
Lifter StyleHydraulic roller
Advertised Duration276 int./282 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
Valve Springs IncludedNo
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.510 int./0.510 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration276
Intake Duration At 050 Inch Lift224
Exhaust Duration At 050 Inch Lift230
Timing Chain StyleDouble roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration282
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift224 int./230 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberSK11-423-8
Package Qty1
Package TypeEA
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