Moroso Ultra 40 Plug Wire Set - BBC HEI 73712

Reliable spark plug wires are foundational to consistent ignition timing and peak engine performance—especially in high-demand big block applications where voltage demands are extreme. The Moroso Ultra 40 delivers low-resistance spiral core construction that minimizes voltage drop, ensuring crisp spark delivery under load while the 90-degree boots route cleanly under headers without kinks or crimping. If you're running a BBC HEI ignition system, this kit eliminates guesswork on fitment and lets you focus on tuning power.

• Ultra 40 spiral core
• 8.65 mm diameter
• Low-resistance design
• 90-degree plug boots
• HEI style terminal
• Under-header routing
• Big Block Chevy
• Complete wire kit
• Black jacket
• MPN: 73712