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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-SK12-240-4
Comp Cams Xtreme Marine Hydraulic Flat Tappet Camshafts
$45795
Ships on 10/20/2026
Lowest Price GuaranteeChevy Small Block 262-400ci 1955-98
- Xtreme Marine Hyd. Flat Tappet Cam Small Kit
Chevy Small Block 262-400ci 1955-98
Lift: .480"/.489"
Duration: 270°/286°
Lobe Separation Angle: 112°
RPM Range: 1600-5800
*Note: In order to use these camshafts in 1955-57 265ci blocks, it is necessary to machine a small groove in the rear main journal of the cam to allow oil flow to the top of the engine.
Jet boat with 'A' impeller, strong mid-range, good throttle response, noticeable idle.
| Operating Range: | 1600-5800 RPM |
| Duration Advertised: | 270° Intake / 286° Exhaust |
| Duration @ .050' Lift: | 226° Intake / 236° Exhaust |
| Valve Lift w/1.5 Rockers: | .480' Intake / .489' Exhaust |
| Lobe Separation Angle: | 112° |
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
Jet boat with A impeller, strong mid-range, good throttle response, 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.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft Kit
BrandCOMP CAMS
Package Height5.2
Package Width10.4
Package Length25.3
Weight17.72 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)236
Cam StyleHydraulic flat tappet
Grind NumberXM270H
Exh. Duration Advertised (Deg)286
Locks IncludedNo
Engine Make/SizeChevy Small Block (262-400)
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.48
Int. Duration @ .050 In. (Deg)226
Assembly Lubricant IncludedYes
Basic Operating Rpm Range1,600-5,800
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.48 in (12.192 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)270
Lobe Separation (Deg)112
Rpm Range1600-5800
Lifter StyleHydraulic flat tappet
Advertised Duration270 int./286 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.489
Valve Springs IncludedNo
UsageMarine
Valve Lift With Factory Rocker Arm Ratio0.480 int./0.489 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.489 in (12.421 mm)
Advertised Intake Duration270
Intake Duration At 050 Inch Lift226
Exhaust Duration At 050 Inch Lift236
Timing Chain StyleDouble non-roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration286
Lifter TypeMechanical Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift226 int./236 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberSK12-240-4
Package Qty1
Package TypeEA
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