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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-SK11-407-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$1,17095
Ships on 09/10/2026
Lowest Price GuaranteeChevrolet Big Block 396-454 c.i. 8 CYL. 1965-1996
- Xtreme Energy Retro-Fit XR252HR Hydraulic Roller Camshaft Small Kit
- Smallest of the line, excellent mileage, smooth idle
Installation Notes:
- Stock springs cannot be used
- Requires thrust button & wear plate
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10
Excellent mileage, smooth idle, strong torque through RPM range.
Lift: .510"/.510"
Duration: 252/258
Lobe Separation Angle: 110°
RPM Range: 600-4600
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 Height5.5
Package Width10.0
Package Length25.5
Weight22.0 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)206
Cam StyleHydraulic roller tappet
Grind NumberXR252HR
Exh. Duration Advertised (Deg)255
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)200
Assembly Lubricant IncludedNo
Basic Operating Rpm Range600-4,600
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)252
Lobe Separation (Deg)110
Rpm Range600-4600
Lifter StyleHydraulic roller
Advertised Duration252 int./258 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 Duration252
Intake Duration At 050 Inch Lift200
Exhaust Duration At 050 Inch Lift206
Timing Chain StyleDouble roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration258
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift200 int./206 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberSK11-407-8
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
