MSD Ignition Cap-A-Dapt Rotor Adjustable
121-8421





Items You Need
Cap-A-Dapt Components
Application:
Specifications:
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?
1981 FORD THUNDERBIRD
- Liter: 5
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 302
- Engine Type: V8 ( 5L / 302 )
- Engine Vin: F
1977 FORD F-350
- Liter: 7.5
- SubModel: RANGER
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 460
- Engine Type: V8 ( 7.5L / 460 )
- Engine Vin: J
1975 FORD E-150 ECONOLINE CLUB WAGON
- Liter: 5.8
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 351
- Engine Type: V8 ( 5.8L / 351 )
- Engine Vin: H
1978 LINCOLN CONTINENTAL
- Liter: 6.6
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 400
- Engine Type: V8 ( 6.6L / 400 )
- Engine Vin: S
1985 FORD F-150
- Liter: 5
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only; This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled [Non-Emissions Controlled] Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
- CUI: 302
- Engine Type: V8 ( 5L / 302 )
- Engine Vin: N
1985 FORD E-150 ECONOLINE
- Liter: 5.8
- SubModel: XL
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 351
- Engine Type: V8 ( 5.8L / 351 )
- Engine Vin: H
1977 FORD F-350
- Liter: 5.8
- SubModel: XLT
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only; This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled [Non-Emissions Controlled] Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
- CUI: 351
- Engine Type: V8 ( 5.8L / 351 )
- Engine Vin: H
1977 FORD LTD II
- Liter: 6.6
- SubModel: SQUIRE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 400
- Engine Type: V8 ( 6.6L / 400 )
- Engine Vin: S
1981 FORD F-150
- Liter: 5.8
- SubModel: RANGER
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 351
- Engine Type: V8 ( 5.8L / 351 )
- Engine Vin: G
1975 FORD LTD
- Liter: 5.8
- SubModel: BROUGHAM
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 351
- Engine Type: V8 ( 5.8L / 351 )
- Engine Vin: H
1981 FORD E-350 ECONOLINE CLUB WAGON
- Liter: 6.6
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only
- CUI: 400
- Engine Type: V8 ( 6.6L / 400 )
- Engine Vin: Z
1982 FORD F-150
- Liter: 5
- SubModel: XL
- Aspiration: NATURALLY ASPIRATED
- Fitment Notes: Adjustable; For MSD Distributor Only; This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled [Non-Emissions Controlled] Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
- CUI: 302
- Engine Type: V8 ( 5L / 302 )
- Engine Vin: F
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.