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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-K51-225-4
Xtreme Energy 284H Hydraulic Flat Tappet Camshaft Complete Kit Lift .507"/.510" Duration 284°/296° RPM Range 2300-6500
$70295
Ships on 09/15/2026
Lowest Price GuaranteePontiac 265-455ci V-8 1955-81
- Xtreme Energy 284H Hydraulic Flat Tappet Camshaft Complete 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;
Street/strip, needs 9:1+ compression. 2800+ stall, headers, gears, rough idle.
Lift .507"/.510"
Duration 284°/296°
RPM Range 2300-6500
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 Height5.7
Package Width10.1
Package Length25.4
Weight23.55 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)246
Cam StyleHydraulic flat tappet
Grind NumberP XE284H-10
Exh. Duration Advertised (Deg)296
Locks IncludedYes
Engine Make/SizePontiac 265-455
Retainers IncludedYes
Intake Valve Lift With Factory Rocker Arm Ratio (I0.507
Int. Duration @ .050 In. (Deg)240
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,300-6,500
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.507 in (12.878 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)284
Lobe Separation (Deg)110
Rpm Range2300-6500
Lifter StyleHydraulic flat tappet
Advertised Duration284 int./296 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
Valve Springs IncludedYes
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.507 int./0.510 exh.
QuantitySold as a kit
Valve Stem Seals IncludedYes
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration284
Outside Diameter Of Outer Spring1.437 in (36.5 mm)
Intake Duration At 050 Inch Lift240
Exhaust Duration At 050 Inch Lift246
Timing Chain StyleDouble non-roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration296
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift240 int./246 exh.
Valve Springs RequiredNo
Lifters IncludedYes
Vendor Part NumberK51-225-4
Package Qty1
Package TypeEA
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