Description
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






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