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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-SK12-243-3
'Xtreme 4x4' Hydraulic Flat Tappet Camshaft
$44695
Ships on 10/19/2026
Lowest Price GuaranteeChevy 262-400ci Small Block 1955-98
- Xtreme 4x4 X4270H Hydraulic Flat Tappet Camshaft Small Kit
Lift: .480''/.498''
Duration: 270°/278°
Lobe Separation Angle: 111°
RPM Range: 1800-6000
*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.
Strong mid-range and throttle response, likes headers, gears, 2200+ stall converter.
| Operating Range: | 1800-6000 RPM |
| Duration Advertised: | 270° Intake / 278° Exhaust |
| Duration @ .050' Lift: | 226° Intake / 234° Exhaust |
| Valve Lift w/1.5 Rockers: | .480' Intake / .498' Exhaust |
| Lobe Separation Angle: | 111° |
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
Strong mid-range and throttle response, likes headers, gears, 2200+ stall.
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 Kit
BrandCOMP CAMS
Package Height5.4
Package Width10.3
Package Length25.4
Weight18.09 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)234
Cam StyleHydraulic flat tappet
Grind NumberCS X4 270H-11
Exh. Duration Advertised (Deg)278
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 Range1,800-6,000
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)111
Rpm Range1800-6000
Lifter StyleHydraulic flat tappet
Advertised Duration270 int./278 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.498
Valve Springs IncludedNo
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.480 int./0.498 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.498 in (12.649 mm)
Advertised Intake Duration270
Intake Duration At 050 Inch Lift226
Exhaust Duration At 050 Inch Lift234
Timing Chain StyleDouble non-roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration278
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift226 int./234 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberSK12-243-3
Package Qty1
Package TypeEA
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