NGK V-Power Nickel Spark Plugs WR5 — 8-Pack for Pre-1980 Ford & Mercury, V-cut Electrode

NGK 2438 OE Series V-Power nickel spark plugs (WR5) are OE-style replacement plugs designed to restore dependable ignitability and smooth idle for select pre-1980 Ford and Mercury engines.

These NGK V-Power plugs are engineered to match original-equipment nickel-plug performance while using NGK materials and manufacturing standards. The V-cut center electrode and concave ground electrode improve the spark’s initiation compared with plain nickel designs, while NGK’s high-grade alumina silicate ceramic insulator and trivalent plating help resist corrosion and seizing. This listing is an 8-pack intended for engines that originally used WR5-style nickel plugs—always confirm fitment against your vehicle or NGK reference before purchasing.

How do these plugs improve starting and idle on older Ford/Mercury engines?

The V-cut center electrode focuses the spark energy to encourage faster flame kernel development at the moment of ignition, which can translate to easier starting and a steadier idle compared with flat-faced nickel plugs. The concave ground electrode complements that geometry to help maintain consistent firing under light-load conditions.

• V-cut nickel alloy center electrode for enhanced ignitability
• Concave ground electrode for more consistent spark gap performance
• Solid copper core for efficient heat dissipation and conductivity

Will these NGK WR5 plugs fit my pre-1980 Ford or Mercury?

These plugs are manufactured to OE-style dimensions: 18 mm thread diameter, 1.5 mm pitch, tapered seat, 11 mm reach, 13/16" (21 mm) hex, and a 1.0 mm (0.039") gap. They are intended for vehicles originally equipped with nickel alloy plugs and should be cross-checked against factory part numbers or NGK fitment charts.

• Thread diameter: 18 mm; pitch: 1.5 mm; reach: 11 mm (7/16")
• Hex size: 13/16" (21 mm); terminal type: solid
• Pre-set gap: 0.039" (1.0 mm); heat range: 5; resistor: 5 kΩ

What materials and construction features keep these plugs reliable over time?

NGK builds these WR5 plugs with a high-grade alumina silicate ceramic insulator for strong dielectric performance and a 98% pure copper core to manage heat and conductivity. The nickel alloy electrodes and trivalent metal plating help prevent corrosion and make installation and removal less prone to seizing compared to unplated steel shells.

• High-grade ceramic insulator for improved electrical stability
• Solid copper core for heat control and electrical conductivity
• Trivalent metal plating for anti-corrosion and anti-seize protection

How should I install and torque these plugs to avoid damage?

Install the plugs by hand until fingertight, then use a torque wrench to reach the recommended range appropriate for your cylinder head material. Tightening to the correct torque prevents thread damage and ensures the proper sealing and heat transfer necessary for plug longevity.

• Torque range for cast iron and aluminum heads: 14.5–21.6 lb·ft
• Hand-start threads to avoid cross-threading, then torque to spec
• Confirm gap and heat range before installation if engine specs differ

Who is this for: This 8-pack of NGK 2438 OE Series V-Power WR5 spark plugs is intended for owners, restorers, and mechanics working on pre-1980 Ford and Mercury vehicles that originally used nickel alloy spark plugs. It’s best for engines where OE-style nickel plugs are specified rather than modern precious-metal plug applications. Verify your engine’s plug type and physical dimensions before ordering to ensure compatibility.