Ultra 40 Plug Wire Set SBF 351W HEI Black

The Ultra 40 Plug Wire Set SBF 351W HEI Black from MOROSO delivers OEM-grade ignition performance for classic and modified small-block Ford 351W engines equipped with HEI distributors. Built for enthusiasts and mechanics who demand reliable spark delivery under high-RPM conditions, this plug wire set addresses the critical need for consistent ignition timing in both street and performance applications. Whether you're restoring a vintage muscle car or tuning a modified engine, quality plug wires are non-negotiable—they directly impact cold starts, fuel economy, and peak horsepower output.

MOROSO's Ultra 40 design features suppression core technology that minimizes radio frequency interference while maintaining low resistance for optimal spark voltage transfer to the spark plugs. The set is engineered specifically for the small-block Ford 351W cylinder configuration, ensuring proper cylinder sequencing and routing clarity for the HEI distributor cap layout. Black insulation provides a professional appearance while protecting against heat degradation and UV exposure—critical factors in engine bays where underhood temperatures regularly exceed 200°F. The wire construction resists cracking and separation that typically occur with inferior aftermarket alternatives, extending service life across multiple seasons of driving.

This plug wire set is essential for 351W engine builders, restoration shops, and performance tuners working with HEI ignition systems—particularly those upgrading from points-based distributors or replacing deteriorated original equipment. Installation is straightforward: simply disconnect the old wires from the distributor cap and spark plugs, then route the new set following the original firing order (1-3-7-2-6-5-4-8 for the 351W). Mechanics appreciate the color-coded and numbered wire ends that prevent cross-firing mistakes. Compatible exclusively with HEI distributors on 351W small-block Fords, this set delivers the ignition reliability needed for consistent performance, whether the engine is stock or modified with higher compression and aggressive cam timing.