Moroso 51040 Ultra Series Black Spark Plug Wire Set, Big Block Chevy, Over Valve Cover, Straight Boots, HEI Distributor

The Moroso 51040 Ultra Series Spark Plug Wire Set is a performance-grade, 8-wire ignition set engineered specifically for Big Block Chevy engines using over-the-valve-cover routing with an HEI distributor. Built in the USA, these unsleeved black wires deliver reliable, high-energy spark transfer for street and performance applications.

Construction & Technology:

• 8mm wire with 350 ohms of resistance per foot for effective EMI/RFI suppression
• Stainless nickel alloy conductor wound 32 times per inch around a conductive, latex-coated heavy fiberglass core
• Dual-layer outer jacket of high-heat resistant EPDM separated by a nylon reinforcing pull tape for added pull strength
• Inner insulation layer provides optimum dielectric strength; outer jacket offers superior heat and flame resistance
• Silicone plug boots protect against high-heat situations and encase sure-grip, snap-lock terminals for positive connections
• Straight plug boot ends; HEI distributor terminal

Wire Lengths Included:

• 1 x 25"
• 1 x 26"
• 1 x 27.25"
• 2 x 28.5"
• 1 x 34.25"
• 1 x 34.75"
• Coil wire length: 36"

The Moroso Ultra Series wire set is the ideal upgrade for Big Block Chevy builds requiring a clean, over-valve-cover wire layout with dependable ignition performance. Available in black (unsleeved); also offered in red and in sleeved variants for added heat protection.