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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-51-225-4
Xtreme Energy 284H Hydraulic Flat Tappet Camshaft Only Lift: .507" /.510" Duration: 284°/296° RPM Range: 2300-6500
$30995
Ships on Sep 15, 2026
Lowest Price GuaranteePontiac 265-455ci V-8 1955-81
- Xtreme Energy 284H Hydraulic Flat Tappet Camshaft Only
Lift: .507''/.510''
Duration: 284°/296°
RPM Range: 2300-6500
Hydraulic-Street / Strip, needs 9:1 comp. 2800+ stall, headers, gears, rough idle.
| Operating Range: | 2300-6500 RPM |
| Duration Advertised: | 284° Intake / 296° Exhaust |
| Duration @ .050' Lift: | 240° Intake / 246° Exhaust |
| Valve Lift w/1.5 Rockers: | .507' Intake / .510' Exhaust |
| Lobe Separation Angle: | 110° |
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.
Part TypeCamshaft
BrandCOMP CAMS
Package Height2.8
Package Width3.0
Package Length24.2
Weight9.05 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)246
Cam StyleHydraulic flat tappet
Grind NumberP XE284H-10
Exh. Duration Advertised (Deg)296
Engine Make/SizePontiac 265-455
Intake Valve Lift With Factory Rocker Arm Ratio (I0.507
Int. Duration @ .050 In. (Deg)240
Basic Operating Rpm Range2,300-6,500
Intake Valve Lift0.507 in (12.878 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)284
Lobe Separation (Deg)110
Rpm Range2300-6500
Advertised Duration284 int./296 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.51
UsageStreet/Performance
Valve Lift With Factory Rocker Arm Ratio0.507 int./0.510 exh.
QuantitySold individually
Exhaust Valve Lift0.51 in (12.954 mm)
Advertised Intake Duration284
Intake Duration At 050 Inch Lift240
Exhaust Duration At 050 Inch Lift246
Advertised Exhaust Duration296
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift240 int./246 exh.
Valve Springs RequiredYes
Vendor Part Number51-225-4
Package Qty1
Package TypeEA
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