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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-21-221-4
Xtreme Energy 256H Hydraulic Flat Tappet Camshaft Only Lift .447"/.455" Duration 256°/268° RPM Range 1000-5200
$30995
Ships on Sep 15, 2026
Lowest Price GuaranteeChrysler 383-440ci Big Block 1959-80
Single Bolt Gear
Single Bolt Gear
- Xtreme Energy 256H Hydraulic Flat Tappet Camshaft Only
Lift .447"/.455"
Duration 256°/268°
RPM Range 1000-5200
Hydraulic-Strong torque through low end and mid-range, good idle.
273, 360, 318, AMC, Dodge, Mopar, Plymouth, Dart, Road Runner, Charger, Challenger, 383, 400, 440, 426, HEMI, 426 Wedge, 426 HEMI, RB, B, HEMI, 392, Chrysler, LA
Strong torque through low end and mid-range, good 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
BrandCOMP CAMS
Package Height2.8
Package Width3.2
Package Length24.1
Weight10.15 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)218
Cam StyleHydraulic flat tappet
Grind NumberCRB XE256H-10
Exh. Duration Advertised (Deg)268
Engine Make/SizeMopar 383-440
Intake Valve Lift With Factory Rocker Arm Ratio (I0.447
Int. Duration @ .050 In. (Deg)212
Basic Operating Rpm Range1,000-5,200
Intake Valve Lift0.447 in (11.354 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)256
Lobe Separation (Deg)110
Rpm Range1000-5200
Advertised Duration256 int./268 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.455
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.447 int./0.455 exh.
Camshaft Gear Attachment1-bolt
QuantitySold individually
Exhaust Valve Lift0.455 in (11.557 mm)
Advertised Intake Duration256
Intake Duration At 050 Inch Lift212
Exhaust Duration At 050 Inch Lift218
Advertised Exhaust Duration268
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift212 int./218 exh.
Valve Springs RequiredYes
Vendor Part Number21-221-4
Package Qty1
Package TypeEA
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