The Pro-Cap Rotor features a deep skirt and thick vanes that create turbulence inside the cap to help prevent ionization and spark scatter. Even the rotor's mounting screws are overmolded with Rynite for increased spark isolation.
Specifications:
- Part Type: Distributor Rotor
- Color: Red
- Fits: PN 7455
- Part Number: 7423
FAQ
What distributor cap does the MSD 7423 rotor fit?
It's designed as a replacement rotor for MSD's Pro-Cap assembly, PN 7455.
Why does the rotor have a deep skirt?
The deep skirt and thick vanes create turbulence inside the cap, which helps prevent ionization and reduce spark scatter.
Are the rotor's mounting screws special?
Yes, they're overmolded with Rynite for increased spark isolation.

