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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-408-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$57795
Ships on Oct 28, 2026
Lowest Price GuaranteeCurrently Unavailable
This product is currently not available. Please call customer service for assistance at 1-800-345-4545.
Chevrolet Big Block 396-454 c.i. 8 CYL. 1965-1996
- Xtreme Energy Retro-Fit XR258HR-10 Hydraulic Roller Camshaft
Lift: .510"/.510"
Duration: 258/264
Lobe Separation Angle: 110°
RPM Range: 1000-5000
Hydraulic Roller-Strong torque, good mileage, RV and towing, use in stock applications.
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Strong torque, good mileage, RV and towing.
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 Height2.9
Package Width3.1
Package Length24.2
Weight10.9 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)212
Cam StyleHydraulic roller tappet
Grind NumberXR258HR
Exh. Duration Advertised (Deg)264
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.51
Int. Duration @ .050 In. (Deg)206
Basic Operating Rpm Range1,000-5,000
Intake Valve Lift0.51 in (12.954 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)258
Lobe Separation (Deg)110
Rpm Range1000-5000
Advertised Duration258 int./264 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 Duration258
Intake Duration At 050 Inch Lift206
Exhaust Duration At 050 Inch Lift212
Advertised Exhaust Duration264
Lifter TypeHydraulic Roller
Duration At 050 Inch Lift206 int./212 exh.
Valve Springs RequiredYes
Vendor Part Number11-408-8
Package Qty1
Package TypeEA
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