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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-422-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$57795
Ships on 09/08/2026
Lowest Price GuaranteeChevy 262-400ci Small Block 1955-98
For engines NOT originally equipped with a hydraulic roller camshaft.
For engines NOT originally equipped with a hydraulic roller camshaft.
- Xtreme Energy XR270HR-10 Retro-Fit Hydraulic Roller Camshaft
Lift: .495''/.502''
Duration: 270°/276°
Lobe Separation Angle: 110°
RPM Range: 1600-5400
| Operating Range: | 1600-5400 RPM |
| Duration Advertised: | 270° Intake/276° Exhaust |
| Duration @ .050': | 218° Intake/224° Exhaust |
| Valve Lift w/1.5 Rockers: | .495' Intake/.502' Exhaust |
| Lobe Separation Angle: | 110° |
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
High performance application, largest with stock converter, noticeable idle.
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 Height2.8
Package Width3.0
Package Length24.4
Weight9.7 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)224
Cam StyleHydraulic roller tappet
Grind NumberCS XR270HR-10
Exh. Duration Advertised (Deg)276
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.495
Int. Duration @ .050 In. (Deg)218
Basic Operating Rpm Range1,600-5,400
Intake Valve Lift0.495 in (12.573 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)270
Lobe Separation (Deg)110
Rpm Range1600-5400
Advertised Duration270 int./276 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.502
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.495 int./0.502 exh.
QuantitySold individually
Exhaust Valve Lift0.502 in (12.751 mm)
Advertised Intake Duration270
Intake Duration At 050 Inch Lift218
Exhaust Duration At 050 Inch Lift224
Advertised Exhaust Duration276
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift218 int./224 exh.
Valve Springs RequiredYes
Vendor Part Number12-422-8
Package Qty1
Package TypeEA
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