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MSD Ignition 8421

Cap-A-Dapt Rotor Adjustable

MSD Ignition 8421

121-8421

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$35.32
$31.79
ON SALE - $3.53 OFF
MSD Ignition 8421 Cap-A-Dapt Rotor Adjustable $31.79
Cap-A-Dapt Rotor
  • Adjustable
  • Chevy V8

  • MSD Ignition 8421 Details

    Cap-A-Dapt Components

    This two-piece rotor allows you to adjust the rotor tip to cap terminal alignment so you can adjust rotor phasing. If you are running a Multi-Step Retard or Timing Controller, the ability to adjust the rotor is beneficial.

    Application:

  • MSD Cap-A-Dapt 121-8420
  • Upgrade to MSD Cap-A-Dapts 121-8445 and 121-8441

  • Specifications:

    Quantity
    Sold individually
    Contact Terminal Material
    Brass
    Manufacturer's Part Number:
    8421

    MSD distributor caps and rotors are designed with performance in mind and molded from high-quality, voltage-insulating material with terminals that resist carbon tracking. Whenever the distributor cap is changed, you should install a new rotor. Likewise, if you're replacing the rotor, be sure to install a new cap as well. MSD has new kits featuring Rynite injection molded distributor caps and retainers to complete your distributor tune-up. MSD also has Cap-A-Dapts to fit large Ford-style caps onto MSD distributors.

    Does MSD Ignition 8421 fit your vehicle?

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    1983-1988 MERCURY COUGAR

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

    1982-1983 FORD MUSTANG

    • EngineType: ALL
    • SubModel: GT

    1991-1992 MERCURY COUGAR

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

    1984 FORD MUSTANG

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

    1985 MERCURY MARQUIS

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

    1980 MERCURY MONARCH

    • Liter: 4.2
    • SubModel: BASE
    • CUI: 255
    • EngineType: V8 ( 4.2 L / 255 )

    1975-1978 FORD LTD

    • EngineType: ALL
    • SubModel: COUNTRY SQUIRE

    1975-1977 FORD LTD

    • CC: 5753
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1991-1993 FORD THUNDERBIRD

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

    1990 FORD BRONCO

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

    1977 FORD F-100

    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1977 FORD F-100

    • Liter: 7.5
    • SubModel: RANGER XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1991-1992 FORD BRONCO

    • Liter: 5.8
    • SubModel: XLT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980-1989 FORD BRONCO

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

    1984-1986 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1984 FORD MUSTANG

    • Liter: 5.0
    • SubModel: GT-350 20TH ANNIVERSARY
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1984-1986 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1977-1978 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: NORTHLAND
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 FORD LTD

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1979-1982 FORD E-150 ECONOLINE CLUB WAGON

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

    1977-1979 LINCOLN MARK V

    • EngineType: ALL
    • SubModel: ALL

    1978 FORD FAIRMONT

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

    1993-1996 FORD BRONCO

    • EngineType: ALL
    • SubModel: EDDIE BAUER

    1975-1978 FORD F-100

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

    1975-1981 FORD F-150

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

    1975 FORD E-100 ECONOLINE

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

    1980 FORD F-350

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

    1986-1990 FORD F-350

    • Liter: 7.5
    • SubModel: XLT LARIAT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1978-1981 FORD F-150

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

    1991-1992 FORD BRONCO

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

    1977-1980 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 FORD MUSTANG II

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

    1975 FORD E-150 ECONOLINE

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

    1978-1979 FORD F-150

    • Liter: 7.5
    • SubModel: RANGER LARIAT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1977-1979 FORD F-150

    • Liter: 6.6
    • SubModel: RANGER
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1975-1979 FORD F-250

    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1992-1996 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: CHATEAU
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1984-1985 LINCOLN MARK VII

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

    1979 FORD F-100

    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 FORD E-350 ECONOLINE

    • Liter: 7.5
    • SubModel: NORTHLAND
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975 FORD E-250 ECONOLINE

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

    1993-1995 FORD MUSTANG

    • EngineType: ALL
    • SubModel: SVT COBRA

    1980-1981 FORD MUSTANG

    • Liter: 4.2
    • SubModel: GHIA
    • CUI: 255
    • EngineType: V8 ( 4.2 L / 255 )

    1985 FORD LTD

    • EngineType: ALL
    • SubModel: LX BROUGHAM

    1975 FORD E-250 ECONOLINE

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

    1986 FORD E-350 ECONOLINE

    • Liter: 7.5
    • SubModel: CARGO
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1993 MERCURY COUGAR

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

    1978-1979 FORD F-350

    • Liter: 7.5
    • SubModel: RANGER LARIAT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1977 FORD GRANADA

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1982-1983 FORD BRONCO

    • Liter: 5.8
    • SubModel: XLS
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1975-1981 FORD F-100

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

    1975-1979 FORD F-150

    • Liter: 7.5
    • SubModel: RANGER
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1979 FORD F-150

    • Liter: 7.5
    • SubModel: RANGER XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1983 FORD E-100 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: XL
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1977-1982 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1984 FORD E-150 ECONOLINE CLUB WAGON

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

    1997 FORD F SUPER DUTY

    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 FORD F-350

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

    1984-1986 FORD E-150 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1979 FORD FAIRMONT

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

    1980 FORD E-250 ECONOLINE

    • Liter: 6.6
    • SubModel: CHATEAU
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1984-1989 FORD BRONCO

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

    1980-1981 MERCURY COUGAR

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

    1982-1996 FORD F-150

    • Liter: 5.8
    • SubModel: XL
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1990 FORD BRONCO

    • EngineType: ALL
    • SubModel: XL

    1980-1982 FORD FAIRMONT

    • Liter: 4.2
    • SubModel: FUTURA
    • CUI: 255
    • EngineType: V8 ( 4.2 L / 255 )

    1988-1991 FORD E-150 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: XL
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1987-1991 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1980-1982 FORD THUNDERBIRD

    • Liter: 4.2
    • SubModel: TOWN LANDAU
    • CUI: 255
    • EngineType: V8 ( 4.2 L / 255 )

    1984-1986 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1979-1983 FORD E-150 ECONOLINE CLUB WAGON

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

    1977 FORD F-150

    • Liter: 5.8
    • SubModel: XLT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980-1982 MERCURY CAPRI

    • Liter: 4.2
    • SubModel: BASE
    • CUI: 255
    • EngineType: V8 ( 4.2 L / 255 )

    1983-1986 FORD F-250

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

    1976-1978 FORD F-250

    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1995-1996 FORD F-250

    • Liter: 7.5
    • SubModel: EDDIE BAUER
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1988-1989 FORD F SUPER DUTY

    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1981-1990 LINCOLN TOWN CAR

    • EngineType: ALL
    • SubModel: ALL

    1983-1985 MERCURY GRAND MARQUIS

    • EngineType: ALL
    • SubModel: COLONY PARK

    1975-1983 FORD E-150 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: CUSTOM
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1977-1979 FORD F-100

    • Liter: 5.8
    • SubModel: RANGER
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980-1982 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1985 FORD E-250 ECONOLINE

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

    1992-1996 FORD E-350 ECONOLINE

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980 FORD THUNDERBIRD

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

    1979-1982 FORD E-100 ECONOLINE CLUB WAGON

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

    1993 FORD MUSTANG

    • EngineType: ALL
    • SubModel: SVT COBRA R

    1977-1978 FORD F-150

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1982 FORD MUSTANG

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

    1995 FORD MUSTANG

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

    1977-1978 FORD F-150

    • Liter: 6.6
    • SubModel: SUPER CAB
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1987-1996 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: CUSTOM
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1979-1982 FORD E-250 ECONOLINE

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

    1995-1996 FORD F-250

    • Liter: 5.8
    • SubModel: EDDIE BAUER
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1983-1996 FORD E-350 ECONOLINE

    • Liter: 5.8
    • SubModel: XL
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1978-1979 FORD F-100

    • Liter: 5.8
    • SubModel: RANGER LARIAT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1986 MERCURY GRAND MARQUIS

    • EngineType: ALL
    • SubModel: BASE

    1983-1986 FORD F-350

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980 FORD F-350

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

    1984-1991 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 7.5
    • SubModel: XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )
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