MSD 8427 GM HEI Late Model Distributor Rotor External Coil Cap

The MSD 8427 is a replacement distributor rotor designed for GM HEI late model distributors equipped with an external ignition coil cap, specifically for use with the MSD late model distributor PN 8366. It is a direct-fit maintenance replacement rotor engineered to deliver reliable spark transfer at both street and high-performance RPM levels.

Key Features:

• Rynite injection-molded construction — high-strength thermoplastic material offers excellent dielectric properties and resistance to carbon tracking
• Low-resistance brass rotor tip — optimizes voltage transfer from the distributor cap to the spark plug terminals
• High-RPM performance design — built to the same specification standard as rotors found on most MSD Pro-Billet distributors
• External coil cap configuration — correctly matches GM HEI late model distributors with a separate external coil
• Emissions compliant — legal for sale and use on emissions-controlled vehicles, non-emissions-controlled vehicles, and racing applications
• Sold individually

Compatible with MSD late model distributor PN 8366. For best results, replace the cap and rotor together as a matched set — pair with MSD distributor cap PN 8426.