Moroso 73728 Ultra 40 Spark Plug Wire Set Big Block Chevy HEI 8.65mm Unsleeved

The Moroso 73728 Ultra 40 spark plug wire set delivers race-proven ignition performance for big block Chevy engines at a cost-effective price point. This complete, ready-to-install wire set is specifically designed for over-valve-cover routing with HEI-style distributor applications.

Advanced Wire Construction:

• 8.65mm diameter wire with 40 ohms of resistance per foot for optimal spark energy transfer
• Spiral-wound nickel/copper alloy conductor wrapped at the optimum ratio for maximum spark energy
• Kevlar core that's four times stronger than standard aramid fiber cores for exceptional durability
• Extra-thick EPDM insulation layer provides superior dielectric strength
• Closely woven fiberglass impregnated with high-voltage-leak resistant silicone adds up to 8,000 volts of extra insulation

Performance Features:

• Superior EMI/RFI suppression minimizes electromagnetic and radio frequency interference
• High-temperature silicone boots withstand heat up to 600 degrees Fahrenheit
• Locking stainless steel plug terminals stay connected under extreme vibration conditions
• Each wire is labeled by cylinder number for easy installation
• Black unsleeved design for applications where external heat sleeving is not required

Manufactured in the USA at Moroso Wire Technologies, this wire set provides professional-grade ignition performance for street and racing applications. The unsleeved design offers a cost-effective solution while maintaining the core performance benefits of Moroso's race-proven Ultra 40 technology.