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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-51-309-4
Drag Race Hydraulic Flat Tappet Camshaft Lift: .520"/.520"
$30995
Ships on 09/14/2026
Lowest Price GuaranteePontiac 265-455ci 1955-81
- Drag Race Hydraulic Flat Tappet Camshaft
- Lift:.520"/.520"
- Duration: 276°/284°
- RPM Range: 2000-6000
- Specialty Camshaft
- 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;
Bracket race with heavy car. 2500-3000 stall, 9.5:1+ compression, more gear, choppy 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 Height2.75
Package Width2.87
Package Length24.5
Weight9.2 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)236
Cam StyleHydraulic flat tappet
Grind Number276AH-10
Exh. Duration Advertised (Deg)284-3
Engine Make/SizePontiac 265-455
Intake Valve Lift With Factory Rocker Arm Ratio (I0.52
Int. Duration @ .050 In. (Deg)228
Basic Operating Rpm Range2,000-6,000
Intake Valve Lift0.52 in (13.208 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)276-3
Lobe Separation (Deg)110
Rpm Range2000-6000
Advertised Duration276 int./284 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.52
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.520 int./0.520 exh.
QuantitySold individually
Exhaust Valve Lift0.52 in (13.208 mm)
Advertised Intake Duration276
Intake Duration At 050 Inch Lift228
Exhaust Duration At 050 Inch Lift236
Advertised Exhaust Duration284
Lifter TypeHydraulic Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift228 int./236 exh.
Valve Springs RequiredYes
Vendor Part Number51-309-4
Package Qty1
Package TypeEA
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