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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-CL11-239-3
'Xtreme 4x4' Hydraulic Flat Tappet Camshaft
$38695
Ships on Oct 28, 2026
Lowest Price GuaranteeCurrently Unavailable
This product is currently not available. Please call customer service for assistance at 1-800-345-4545.
Chevy 396-454ci Big Block 1965-96
- Xtreme 4x4 X4270H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .544''/.564''
Duration: 270°/278°
Lobe Separation Angle: 111°
RPM Range: 1600-5800
*Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16' wide x 7/64' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine.
Best with improved intake manifold, needs headers, 2000+ stall converter and 3.55-3.90 gears.
| Operating Range: | 1600-5800 RPM |
| Duration Advertised: | 270° Intake / 278° Exhaust |
| Duration @ .050' Lift: | 226° Intake / 234° Exhaust |
| Valve Lift w/1.7 Rockers: | .544' Intake / .564' Exhaust |
| Lobe Separation Angle: | 111° |
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
Best with improved intake manifold, needs headers and 3.55-3.90 gears. 2000+ 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 Height3.0
Package Width5.7
Package Length25.5
Weight14.73 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)234
Cam StyleHydraulic flat tappet
Grind NumberCB X4 270H-11
Exh. Duration Advertised (Deg)278
Locks IncludedNo
Engine Make/SizeChevy Big Block (396-502)
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.544
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 Lift0.544 in (13.818 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)270
Lobe Separation (Deg)111
Rpm Range1600-5800
Lifter StyleHydraulic flat tappet
Advertised Duration270 int./278 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.564
Valve Springs IncludedNo
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.544 int./0.564 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.564 in (14.326 mm)
Advertised Intake Duration270
Intake Duration At 050 Inch Lift226
Exhaust Duration At 050 Inch Lift234
Timing Chain And Gears IncludedNo
Advertised Exhaust Duration278
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift226 int./234 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberCL11-239-3
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
