Ultra 40 Plug Wire Set SBF 302 HEI Black

The Ultra 40 Plug Wire Set SBF 302 HEI from MOROSO is engineered for small-block Ford enthusiasts running HEI ignition systems who demand reliable spark delivery and clean engine bay aesthetics. Whether you're tuning a street machine, restoring a classic cruiser, or maintaining daily-driver performance, premium ignition wires are foundational to consistent combustion and starting reliability. This wire set addresses a critical gap in the ignition chain—delivering maximum voltage from distributor to spark plugs without voltage loss, crossfire, or noise interference that degrades timing accuracy.

MOROSO's Ultra 40 design incorporates suppression-core construction that balances high dielectric strength with controlled impedance, essential for HEI systems that fire at higher voltages than conventional points ignition. The black insulation resists cracking from engine heat cycling and UV exposure, while the core material prevents electromagnetic noise that can interfere with fuel injection systems or aftermarket engine management computers. Proper wire selection matters: incorrect resistance or poor shielding introduces voltage drop at idle and under load, robbing horsepower and increasing plug fouling—especially critical in modified or high-compression engines where ignition margin is already tight.

This wire set is purpose-built for 302 cubic-inch small-block Ford engines equipped with HEI distributors, making it ideal for street rods, performance restorations, and any 5.0L platform running aftermarket ignition upgrades. Installation is straightforward—route wires away from heat sources and moving belts, and verify firing order before starting to avoid cross-cylinder ignition. The compact 9.5 × 3.8 × 9.55-inch package fits tight engine bays, and the complete set ensures matched impedance across all cylinders for even voltage distribution and repeatable ignition timing. For anyone serious about SBF reliability and spark integrity, this MOROSO set delivers OEM-quality consistency with performance-oriented construction.