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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-423-8
Comp Cams Xtreme Energy Hydraulic Roller Camshafts
$57795
Ships on Oct 13, 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 XR676HR Retro-Fit Hydraulic Roller Camshaft
Lift: .502''/.510''
Duration: 276°/282°
Lobe Separation Angle: 110°
RPM Range: 1900-5600
High Performance street machines 2000+ stall converter lower gear ratio recommended choppy idle.
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 street machines, 2000+ stall, gears, choppy 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.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft
BrandCOMP CAMS
Package Height2.8
Package Width3.0
Package Length24.3
Weight9.7 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic roller tappet
Grind NumberCS XR276HR-10
Exh. Duration Advertised (Deg)282
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.502
Int. Duration @ .050 In. (Deg)224
Basic Operating Rpm Range1,900-5,600
Intake Valve Lift0.502 in (12.751 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)276
Lobe Separation (Deg)110
Rpm Range1900-5600
Advertised Duration276 int./282 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.502 int./0.510 exh.
QuantitySold individually
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration276
Intake Duration At 050 Inch Lift224
Exhaust Duration At 050 Inch Lift230
Advertised Exhaust Duration282
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift224 int./230 exh.
Valve Springs RequiredYes
Vendor Part Number12-423-8
Package Qty1
Package TypeEA
No Questions
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