The NGK 3403 G-Power Platinum spark plug is a replacement plug for 1978-2019 Ford, Chevrolet, GMC and other makes. It has M14-1.25 threads, a 0.689 in. reach, a 5/8 in. (16 mm) hex and a heat range of 5. A fine wire platinum center electrode tip and trapezoid-cut ground electrode give it longer life and quicker starts than a nickel plug.

NGK 3403 G-Power Platinum Spark Plug Features:

• Fits 1978-2019 Ford, Chevrolet, GMC and Other Makes; see Fitment tab for all applications
• M14-1.25 metric thread with 0.689 in. reach
• 5/8 in. (16 mm) hex
• Tapered seat
• Heat range 5
• 0.060 in. factory pre-gap
• Platinum center electrode tip with nickel ground electrode tip
• Resistor type (5000 ohm) for ignition noise suppression
• Non-removable nut terminal
• 2.070 in. insulator height
• Fine wire 0.6 mm platinum center electrode tip for longer service life than a nickel plug
• Trapezoid-cut ground electrode reduces flame quenching for better ignitability
• Copper core center electrode draws heat away from the firing end
• Rolled threads help prevent cross-threading in the cylinder head
• An upgrade for engines that originally used nickel alloy plugs
• Sold individually