Denso 671-6071 Spark Plug Wire Set

Denso 8mm Spark Plug Wire Set for OE Fit

The Denso 671-6071 spark plug wire set is built to match factory-installed wire sets in form, fit, color, and performance. It is a direct replacement for select Ford and Mercury applications, including Ford Mustang and Mercury Capri models from the late 1970s through the early 1980s.

Key Features

• 8mm insulation outside diameter for OE-style wire routing and fit
• Silicone spark plug boot material for heat resistance and durability
• Female distributor coil end terminal type
• 180-degree spark plug end boot design for proper connection clearance
• Female spark plug end terminal type
• Built to meet or exceed OE/OES standards in construction

Product Details

Denso First Time Fit ignition wire sets are engineered as direct OE replacements, with dimensions and terminal styles matched to the original application. The 671-6071 is designed for vehicles that require an 8mm wire set with female terminals and 180-degree spark plug boots, helping maintain proper ignition connection and routing. This part number is a strong match for owners searching for a Denso 671-6071 replacement for Ford Mustang or Mercury Capri ignition service.

Compatible With select applications such as 1979-1982 Ford Mustang, 1979-1982 Mercury Capri, 1978-1983 Ford Fairmont, and 1978-1983 Mercury Zephyr. It also fits 1980-1982 Ford Thunderbird, 1980-1982 Mercury Cougar, 1977-1980 Mercury Monarch, 1983 Ford LTD, and 1983 Mercury Marquis. This part cross-references ACDelco 16-816A and Bosch 09623 for the same application.

Common Issues This Part Can Address

• Cracked or heat-damaged ignition wire insulation
• Loose or worn terminal connections at the spark plug or coil end
• Misfire caused by deteriorated wire resistance or internal breakdown
• Hard starting related to weak ignition transfer
• Routing or fitment problems from incorrect replacement wire dimensions

Installation Notes and Quality Assurance

Verify engine configuration, terminal style, and boot angle before installation to confirm the correct fit for your vehicle. Route the wires to match the original layout and keep them separated from hot or moving components. Denso’s First Time Fit line is positioned as an OE-style replacement range, with construction that meets or exceeds OE/OES standards for the listed applications.