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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-SK51-221-4
Xtreme Energy 256H Hydraulic Flat Tappet Camshaft Small Kit Lift: .447" /.455" Duration: 256°/268° RPM Range: 1000-5200
$41795
Ships on 10/23/2026
Lowest Price GuaranteePontiac 265-455ci V-8 1955-81
- Xtreme Energy 256H Hydraulic Flat Tappet Camshaft Small Kit
- Produces Better Throttle Response
- Produces Top Engine Horsepower
- Delivers Increased Engine Vacuum
- 1 Year Limited Warranty
Pontiac; Super Duty; SD; SD455; HO; 455 HO; Trans-Am; Catalina; Firebird; Formula; 421; 455; 400; 428; 350; 265; 301; 370; 389; 301; 287; 317; 347; Ram Air; Ram Air IV; Ram Air III; Bonneville; Grand Prix; LeMans; Parisienne; Grand Am; Century; Regal;
Strong torque through low end and mid-range, good idle.
Lift: .447''/.455''
Duration: 256°/268°
RPM Range: 1000-5200
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 Height5.0
Package Width10.5
Package Length26.0
Weight22.0 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)218
Cam StyleHydraulic flat tappet
Grind NumberXE256H
Exh. Duration Advertised (Deg)268
Locks IncludedNo
Engine Make/SizePontiac 265-455
Retainers IncludedNo
Intake Valve Lift With Factory Rocker Arm Ratio (I0.447
Int. Duration @ .050 In. (Deg)212
Assembly Lubricant IncludedYes
Basic Operating Rpm Range1,000-5,200
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.447 in (11.354 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)256
Lobe Separation (Deg)110
Rpm Range1000-5200
Lifter StyleHydraulic flat tappet
Advertised Duration256 int./268 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.455
Valve Springs IncludedNo
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.447 int./0.455 exh.
QuantitySold as a kit
Valve Stem Seals IncludedNo
Exhaust Valve Lift0.455 in (11.557 mm)
Advertised Intake Duration256
Intake Duration At 050 Inch Lift212
Exhaust Duration At 050 Inch Lift218
Timing Chain StyleDouble non-roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration268
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift212 int./218 exh.
Valve Springs RequiredYes
Lifters IncludedYes
Vendor Part NumberSK51-221-4
Package Qty1
Package TypeEA
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