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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-407-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$52299
Ships on 09/09/2026
Lowest Price GuaranteeChevrolet Big Block 396-454 c.i. 8 CYL. 1965-1996
- Xtreme Energy Retro-Fit XR252HR-10 Hydraulic Roller Camshaft
Lift: .510"/.510"
Duration: 252/258
Lobe Separation Angle: 110°
RPM Range: 600-4600
Hydraulic Roller-Smallest of the line, excellent mileage, smooth idle.
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Excellent mileage, smooth idle, strong torque through RPM range.
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
BrandCOMP CAMS
Package Height2.75
Package Width3.0
Package Length24.5
Weight10.41 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)206
Cam StyleHydraulic roller tappet
Grind NumberCB XR252HR-10
Exh. Duration Advertised (Deg)258
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.51
Int. Duration @ .050 In. (Deg)200
Basic Operating Rpm Range600-4,600
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)252
Lobe Separation (Deg)110
Rpm Range600-4600
Advertised Duration252 int./258 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.510 int./0.510 exh.
QuantitySold individually
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration252
Intake Duration At 050 Inch Lift200
Exhaust Duration At 050 Inch Lift206
Advertised Exhaust Duration258
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift200 int./206 exh.
Valve Springs RequiredYes
Vendor Part Number11-407-8
Package Qty1
Package TypeEA
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