Mutha" Thumpr Hydraulic Flat Tappet Camshaft Complete Kit Lift .490"/.475" Duration 287/305 RPM Range 2200-6100
InfoVehicle Info Needed
COMP CAMSPART NUMBER: 249-K51-601-5

Mutha" Thumpr Hydraulic Flat Tappet Camshaft Complete Kit Lift .490"/.475" Duration 287/305 RPM Range 2200-6100

$76695
ShippingShips on 10/23/2026
Lowest PriceLowest Price Guarantee

Pontiac 265-455ci 8 cyl. 1955-1981
    Mutha' Thumpr Hydraulic Flat Tappet Camshaft Complete Kit
    Lift .490"/.475"
    Duration 287/305
    RPM Range 2200-6100

  • Complete Camshaft Kit
  • 3 Grinds To Fit All Of Your Performance Needs
  • Long Exhaust Duration
  • Produces A Powerful Hard-Hitting Exhaust Note
  • Excellent Horsepower Gains And Broad Torque Curve
  • Delivers Real Seat Of The Pants Performance
  • Designed For Use w/Latest In ValveTrain Components
  • 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;


    High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough 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 Kit
BrandCOMP CAMS
Package Height5.0
Package Width10.5
Package Length26.0
Weight26.0 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)249
Cam StyleHydraulic flat tappet
Grind Number287TH7
Exh. Duration Advertised (Deg)305
Locks IncludedYes
Engine Make/SizePontiac 265-455
Retainers IncludedYes
Intake Valve Lift With Factory Rocker Arm Ratio (I0.49
Int. Duration @ .050 In. (Deg)235
Assembly Lubricant IncludedYes
Basic Operating Rpm Range2,200-6,100
Pushrods IncludedNo
Gaskets IncludedNo
Rocker Arms IncludedNo
Intake Valve Lift0.49 in (12.446 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)287
Lobe Separation (Deg)107
Rpm Range2200-6100
Lifter StyleHydraulic flat tappet
Advertised Duration287 int./305 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.475
Valve Springs IncludedYes
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.490 int./0.475 exh.
QuantitySold as a kit
Valve Stem Seals IncludedYes
Exhaust Valve Lift0.475 in (12.065 mm)
Advertised Intake Duration287
Outside Diameter Of Outer Spring1.437 in (36.5 mm)
Intake Duration At 050 Inch Lift235
Exhaust Duration At 050 Inch Lift249
Timing Chain StyleDouble roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration305
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift235 int./249 exh.
Valve Springs RequiredNo
Lifters IncludedYes
Vendor Part NumberK51-601-5
Package Qty1
Package TypeEA
No Questions
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