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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-418-8
Xtreme Marine XM276HR Retro-Fit Hydraulic Roller Camshaft Only Lift .503"/.510" Duration 276°/282° RPM Range 1800-5800
$57795
Ships on 09/15/2026
Lowest Price GuaranteeChevrolet 262-400ci 1955-1998 Retro-Fit
- Xtreme Marine XM276HR Retro-Fit Hydraulic Roller Camshaft Only
Lift .503"/.510"
Duration 276°/282°
RPM Range 1800-5800
Hydraulic Roller-Good for jet with A impeller, strong mid-range power, needs good exhaust.
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
Good for jet with A impeller, strong mid-range power, needs good exhaust.
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 Width3.2
Package Length24.3
Weight8.8 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)230
Cam StyleHydraulic roller tappet
Grind NumberCS XM276HR
Exh. Duration Advertised (Deg)282
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.503
Int. Duration @ .050 In. (Deg)224
Basic Operating Rpm Range1,800-5,800
Intake Valve Lift0.503 in (12.776 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)276
Lobe Separation (Deg)112
Rpm Range1800-5800
Advertised Duration276 int./282 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
UsageMarine
Valve Lift With Factory Rocker Arm Ratio0.503 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 Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift224 int./230 exh.
Valve Springs RequiredYes
Vendor Part Number12-418-8
Package Qty1
Package TypeEA
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