Denso 671-6104 Spark Plug Wire Set

Denso 671-6104 Ignition Wire Set

Denso 671-6104 is a 7mm spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It is a direct OE-style ignition wire replacement for select Ford trucks and vans, including Ford F-100, F-250, F-350, and Econoline applications.

The Denso 7mm line focuses on OE-style construction for dependable ignition transfer and consistent routing. This spark plug wire set uses silicone boot material and a 180-degree spark plug end boot design to support proper connection at the plug end, while the male distributor/coil end terminal type matches the listed applications.

Key Features

• 7mm insulation outside diameter for OE-style ignition wire replacement
• Silicone spark plug boot material for heat-resistant boot construction
• 180-degree spark plug end boot degree for listed routing requirements
• Female spark plug end terminal type
• Male distributor/coil end terminal type
• Built to meet or exceed OE/OES standards according to Denso
• Direct replacement for select Ford ignition wire applications

Product Details

Denso First Time Fit ignition wire sets are engineered to mirror the original wire set in fit and performance, making them a practical choice when replacing aging or damaged ignition leads. Part number 671-6104 is listed for 1965 Ford Econoline, 1967-1976 Ford F-100, 1967-1976 Ford F-250, 1967-1976 Ford F-350, 1969-1976 Ford E-100 Econoline, 1975-1976 Ford E-100 Econoline Club Wagon, 1975-1976 Ford E-150 Econoline, 1975-1976 Ford E-150 Econoline Club Wagon, 1975-1976 Ford E-250 Econoline, and 1975-1976 Ford E-350 Econoline. If you are searching for a Denso 671-6104 spark plug wire set for a Ford F-150 or Ford Econoline ignition service, this part matches the listed 7mm applications.

This part cross-references ACDelco 16-806X and Wells QW627 for the same application.

What It Helps Address

• Misfires caused by worn or deteriorated ignition wires
• Hard starting related to weak spark delivery
• Rough idle from inconsistent ignition transfer
• Voltage leakage from cracked or aged wire insulation
• Routing or terminal mismatch during ignition wire replacement

Installation Notes and Tips

Verify engine layout, distributor location, and wire routing before installation. Match each lead to the correct cylinder and follow the original routing path to reduce crossfire and heat exposure. Confirm the spark plug end uses the listed female terminal style and the distributor/coil end uses the listed male terminal type before final fitment on Ford F-100, F-250, F-350, and Econoline models.

Quality Assurance

Denso states that First Time Fit ignition wire sets are built to OE/OES standards and are intended to match factory-installed wire sets in form, fit, color, and performance. Part number 671-6104 is part of Denso’s 7mm product line for OE-style ignition service.