Moroso 51039 Ultra 350 8mm Spark Plug Wires Black HEI for Chevy BBC 366-454

Vehicle Fitment

• Chevy Big Block 366 (HEI-style distributor, coil NOT in cap)
• Chevy Big Block 396 (HEI-style distributor, coil NOT in cap)
• Chevy Big Block 402 (HEI-style distributor, coil NOT in cap)
• Chevy Big Block 427 (HEI-style distributor, coil NOT in cap)
• Chevy Big Block 454 (HEI-style distributor, coil NOT in cap)

Fitment Notes

• For HEI-style distributors WITHOUT the coil in the cap - confirm your cap style before ordering
• Designed for over header / over valve cover routing
• Red version of this set is Moroso 52039

Features

• Ultra 350 spiral-core ignition wire engineered to meet or exceed OEM specifications
• 350 ohms resistance per foot
• Stainless nickel alloy conductor wound around a conductive fiberglass core for reliable spark delivery
• Dual-layer high-heat EPDM outer jacket for superior heat and flame resistance
• Nylon reinforcing pull tape between jacket layers adds pull strength
• Inner insulation layer adds dielectric strength; effective RFI/EMI suppression
• Silicone plug boots with sure-grip, snap-lock terminals for positive connections
• Multi-angle boots for flexible routing over header and valve cover; made in the USA

Specifications

• Product line: Moroso Ultra 350
• Wire diameter: 8mm
• Resistance: 350 ohms per foot
• Conductor: Spiral core, stainless nickel alloy
• Boot style: Multi-angle
• Distributor cap: HEI-style, without coil in cap
• Routing: Over header / over valve cover
• Color: Black

Included Components

• 1x Moroso 51039 Ultra 350 spark plug wire set (complete set for one engine)

Product Description

The Moroso 51039 is an Ultra 350 spiral-core spark plug wire set in black, built for Chevy Big Block 366-454 engines running an HEI-style distributor that does not have the coil in the cap. The Ultra 350 wire uses a stainless nickel alloy conductor on a spiral core at 350 ohms per foot, engineered to meet or exceed OEM specifications - a strong, cost-effective choice for street and performance big-block applications.

The dual-layer high-heat EPDM jacket, separated by a nylon reinforcing pull tape, resists heat and flame while adding pull strength, and the inner insulation layer boosts dielectric strength with good RFI/EMI suppression. Silicone plug boots encase sure-grip, snap-lock terminals for positive connections, and the 8mm black wires use multi-angle boots designed for over header / over valve cover routing. The set comes complete for one engine.