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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-11-451-8
Xtreme Marine XM284HR Retro-Fit Hydraulic Roller Camshaft Only Lift .547"/.547" Duration 284°/290° RPM Range 2200-5800
$57795
Ships on Sep 15, 2026
Lowest Price GuaranteeChevrolet 396-454 c.i. 8 CYL. 1965-1996 Retro-Fit
- Xtreme Marine XM284HR Retro-Fit Hydraulic Roller Camshaft Only
Lift .547"/.547"
Duration 284°/290°
RPM Range 2200-5800
Hydraulic Roller-Good for inboard/ outboard pleasure boats, has good 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
Good for jet boat with A impeller. Great for pleasure or mild performance use.
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 Height2.7
Package Width3.2
Package Length24.3
Weight10.8 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)236
Cam StyleHydraulic roller tappet
Grind NumberCB XM 284HR-12
Exh. Duration Advertised (Deg)290
Engine Make/SizeChevy Big Block (396-454)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.547
Int. Duration @ .050 In. (Deg)230
Basic Operating Rpm Range2,200-5,800
Intake Valve Lift0.547 in (13.894 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)284
Lobe Separation (Deg)112
Rpm Range2200-5800
Advertised Duration284 int./290 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.547
UsageMarine
Valve Lift With Factory Rocker Arm Ratio0.547 int./0.547 exh.
QuantitySold individually
Exhaust Valve Lift0.547 in (13.894 mm)
Advertised Intake Duration284
Intake Duration At 050 Inch Lift230
Exhaust Duration At 050 Inch Lift236
Advertised Exhaust Duration290
Lifter TypeHydraulic Roller
Part FitmentSemi Universal
Duration At 050 Inch Lift230 int./236 exh.
Valve Springs RequiredYes
Vendor Part Number11-451-8
Package Qty1
Package TypeEA
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