Plug Wire Set Ford 351M-400

The MSD IGNITION Plug Wire Set Ford 351M-400 is a premium ignition harness engineered for classic and modified Ford engines running Cleveland and 351M/400 platforms. Built for enthusiasts and mechanics who demand reliability during high-performance driving, this Super Conductor wire set replaces OEM ignition systems with modern spiral-core technology. Whether you're restoring a vintage muscle car or upgrading a street machine, this wire kit delivers the consistent spark timing needed for optimal combustion and power delivery across the RPM band.

Each wire in this eight-cylinder set features an 8.5 mm Super Conductor spiral core that minimizes electrical noise and EMI interference, critical for modern fuel injection and engine management systems. The red PVC jacket provides heat resistance and visibility during engine bay work, while straight plug boots and HEI-style terminals ensure secure, corrosion-resistant connections at both the distributor cap and spark plugs. Spiral-core construction—as opposed to traditional solid-core or carbon-core designs—offers superior insulation and signal integrity without the high resistance that can rob horsepower or degrade ignition timing precision.

This wire set is ideal for Ford 351M and 400 cubic-inch engines in street cars, vintage hot rods, and modified performance vehicles. Installation is straightforward: remove the old wire set and route the new harness along the same path, seating each boot firmly onto the spark plug and terminal. The HEI-style terminal fits standard distributor caps found on most classic Ford ignition systems, making this a direct replacement that requires no additional adapters or modifications. Mechanics and DIY builders appreciate the durability and consistent spark delivery this MSD system provides, especially in high-vibration or temperature-extreme engine bays.