800.345.4545
Unrivaled Customer Service
And Expert Tech Advice!  
FREE SHIPPING!
Same Day Shipping Before 11 PM ET
0
My Cart
0
$0.00
Shop By Vehicle
Shop By
Category
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories


Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates
Rebates
Help

COMP Cams Big Mutha" Thumpr Hydraulic Flat Tappet Camshaft Complete Kit Lift .512"/.497" Duration 295/312 RPM Range 2500-6400

COMP Cams K31-603-5

249-K31-603-5

jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
$445.99
COMP Cams Big Mutha" Thumpr Hydraulic Flat Tappet Camshaft Complete Kit Lift .512"/.497" Duration 295/312 RPM Range 2500-6400 $445.99
To order this item contact Customer Service at 1-800-345-4545.
Big Mutha' Thumpr Hydraulic Flat Tappet Camshaft Complete Kit
Lift .512"/.497"
Duration 295/312
RPM Range 2500-6400

COMP Cams K31-603-5 Details

Ford 289-302 C.I. 8 cyl. 1963-1995

  • Complete 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

  • Specifications:

    Exhaust Valve Lift (in.)
    0.497
    Intake Valve Lift (in.)
    0.512
    Int. Duration @ .050 in. (Deg)
    243
    Exh. Duration @ .050 in. (Deg)
    257
    Int. Duration Advertised (Deg)
    295
    Exh. Duration Advertised (Deg)
    312
    Engine Make/Size
    Ford 289-302
    Lifter Type
    Hydraulic Flat Tappet
    RPM Range
    2500-6400
    Usage
    Street/Hi-Performance
    Manufacturer's Part Number:
    K31-603-5

    Thumpr Camshafts are the hottest cams to hit the streets in more than a decade. That's because they give you the big cam sound you're looking for, without the drawbacks. Applying a camshaft design originally created for sports car endurance racing, they incorporate early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap. Best of all, Thumprs will not negatively impact power output or streetability.

    Features:
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note
  • Best with aftermarket converters and more rear gear


    Thumpr Sound ClipClick to Listen

    Camshaft & Lifter Kits are indicated by a CL in their part number and include Camshaft, Lifters, Assembly Lube, Decals, and Instructions.

    Complete Kits are indicated by a K in their part number and include Camshaft, Lifters, Timing Chain & Gears, Valve Springs, Retainers, Locks, Assembly Lube, Decals, and Instructions.

  • Does COMP Cams K31-603-5 fit your vehicle?

    Narrow Results

    1967 FORD FAIRLANE

    • Liter: 4.7
    • SubModel: 500
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1978 FORD FAIRMONT

    • CC: 4950
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: F
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1977-1978 FORD LTD II

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1965 FORD FALCON SEDAN DELIVERY

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1987-1991 MERCURY GRAND MARQUIS

    • EngineType: ALL
    • SubModel: LS

    1982 FORD MUSTANG

    • Liter: 5.0
    • SubModel: GLX
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1969 MERCURY COUGAR

    • CC: 4950
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BOSS 302
    • Engine Vin: G
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1964-1967 MERCURY CALIENTE

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1982 MERCURY CAPRI

    • Liter: 5.0
    • SubModel: RS
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1991-1992 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1967 MERCURY COUGAR

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1965 FORD FALCON

    • EngineType: ALL
    • SubModel: FUTURA SPRINT

    1978-1979 MERCURY ZEPHYR

    • Liter: 5.0
    • SubModel: Z7
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1963-1967 FORD FAIRLANE

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1993 FORD MUSTANG

    • EngineType: ALL
    • SubModel: SVT COBRA R

    1963-1967 FORD RANCH WAGON

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1977-1979 FORD LTD

    • Liter: 5.0
    • SubModel: LANDAU
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1986-1987 LINCOLN CONTINENTAL

    • EngineType: ALL
    • SubModel: ALL

    1978-1979 MERCURY ZEPHYR

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1974 FORD GRAN TORINO

    • CC: 4949
    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1969 FORD FAIRLANE

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975-1980 FORD GRANADA

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1982 LINCOLN CONTINENTAL

    • Liter: 5.0
    • SubModel: SIGNATURE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1991-1992 MERCURY COUGAR

    • EngineType: ALL
    • SubModel: XR-7

    1963-1966 FORD FAIRLANE

    • Liter: 4.7
    • SubModel: 500
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1968 MERCURY COUGAR

    • CC: 4949
    • Liter: 5.0
    • SubModel: XR-7
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1983-1986 FORD LTD

    • Liter: 5.0
    • SubModel: COUNTRY SQUIRE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1970 FORD MUSTANG

    • CC: 4950
    • Liter: 5.0
    • SubModel: MACH I
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1978-1980 FORD GRANADA

    • Liter: 5.0
    • SubModel: ESS
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1985-1993 FORD MUSTANG

    • EngineType: ALL
    • SubModel: GT

    1966-1967 FORD GT40

    • CC: 4727
    • Liter: 4.7
    • SubModel: MK III
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1964 FORD FALCON

    • Liter: 4.7
    • SubModel: FUTURA SPRINT
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1983 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: HERITAGE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1972-1973 MERCURY MONTEGO

    • CC: 4949
    • Liter: 5.0
    • SubModel: GT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1977-1981 MERCURY COUGAR

    • Liter: 5.0
    • SubModel: XR-7
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1972 FORD RANCH WAGON

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1983-1988 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: LX
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1987-1991 FORD LTD CROWN VICTORIA

    • EngineType: ALL
    • SubModel: LX

    1968-1972 FORD GALAXIE 500

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1983-1988 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1980-1982 FORD LTD

    • Liter: 5.0
    • SubModel: S
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1969-1971 FORD TORINO

    • CC: 4949
    • Liter: 5.0
    • SubModel: SQUIRE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1970-1971 FORD TORINO

    • CC: 4949
    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975-1977 MERCURY COMET

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1967 FORD FAIRLANE

    • Liter: 4.7
    • SubModel: 500XL
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1975-1977 FORD MAVERICK

    • Liter: 5.0
    • SubModel: GRABBER
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1972 FORD MUSTANG

    • CC: 4950
    • Liter: 5.0
    • SubModel: MACH I
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1986 FORD LTD

    • Liter: 5.0
    • SubModel: CROWN VICTORIA LX
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1994 FORD MUSTANG

    • CC: 4949
    • Liter: 5.0
    • Aspiration: N
    • SubModel: GT
    • Engine Vin: T
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1977-1979 FORD LTD II

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1983 LINCOLN CONTINENTAL

    • EngineType: ALL
    • SubModel: ALL

    1975-1980 FORD GRANADA

    • Liter: 5.0
    • SubModel: GHIA
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1979-1986 MERCURY GRAND MARQUIS

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975-1977 FORD MAVERICK

    • CC: 4950
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: F
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1986 MERCURY GRAND MARQUIS

    • Liter: 5.0
    • SubModel: COLONY PARK
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1969 MERCURY CYCLONE

    • CC: 4949
    • Liter: 5.0
    • SubModel: CJ
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1976 MERCURY MONARCH

    • Liter: 5.0
    • SubModel: GRAND GHIA
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1972-1974 FORD GRAN TORINO

    • CC: 4949
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1984-1985 LINCOLN CONTINENTAL

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1986 FORD LTD

    • Liter: 5.0
    • SubModel: COUNTRY SQUIRE LX
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1979-1981 MERCURY GRAND MARQUIS

    • Liter: 5.0
    • SubModel: COLONY PARK
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1977-1982 FORD LTD

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1984-1986 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: ELAN
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1982-1985 MERCURY GRAND MARQUIS

    • EngineType: ALL
    • SubModel: COLONY PARK

    1965-1967 FORD LTD

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1968-1972 FORD CUSTOM

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1971 FORD MUSTANG

    • CC: 4949
    • Liter: 5.0
    • SubModel: MACH I
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1991-1992 MERCURY COUGAR

    • Liter: 5.0
    • SubModel: LS
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1979 FORD MUSTANG

    • CC: 4949
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: F
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975-1980 MERCURY MONARCH

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1985 FORD LTD

    • EngineType: ALL
    • SubModel: LX BROUGHAM

    1984-1985 LINCOLN MARK VII

    • Liter: 5.0
    • SubModel: BILL BLASS
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1984 FORD MUSTANG

    • Liter: 5.0
    • SubModel: GT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968 MERCURY COUGAR

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975-1977 MERCURY MONARCH

    • Liter: 5.0
    • SubModel: GHIA
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1982 FORD MUSTANG

    • Liter: 5.0
    • SubModel: L
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1964-1967 FORD MUSTANG

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1978-1979 FORD FAIRMONT

    • Liter: 5.0
    • SubModel: FUTURA
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1972 FORD CUSTOM 500

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968 FORD MUSTANG

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1984-1985 FORD THUNDERBIRD

    • Liter: 5.0
    • SubModel: FILA
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1964-1967 MERCURY VILLAGER

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1984-1985 LINCOLN MARK VII

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1977 MERCURY COUGAR

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1970-1974 MERCURY MONTEGO

    • CC: 4949
    • Liter: 5.0
    • SubModel: MX BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1970-1974 MERCURY MONTEGO

    • CC: 4949
    • Liter: 5.0
    • SubModel: VILLAGER
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1974 MERCURY MONTEGO

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1964-1967 MERCURY COMET

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1977-1979 FORD LTD II

    • Liter: 5.0
    • SubModel: S
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1984-1985 FORD LTD

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1979 FORD FAIRMONT

    • CC: 4949
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: F
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1972 FORD COUNTRY SQUIRE

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1966-1967 MERCURY VOYAGER

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1964-1967 FORD FALCON

    • Liter: 4.7
    • SubModel: FUTURA
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1982 LINCOLN CONTINENTAL

    • Liter: 5.0
    • SubModel: GIVENCHY
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1964-1967 MERCURY CYCLONE

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1965-1967 FORD CUSTOM

    • CC: 4727
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1968-1971 FORD TORINO

    • CC: 4949
    • Liter: 5.0
    • SubModel: GT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1968-1972 FORD LTD

    • CC: 4949
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1971-1972 FORD LTD

    • CC: 4949
    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations