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The NGK R7438-8 is a racing-grade iridium spark plug sold in a box of four. It uses a fine iridium center electrode and a 5 kOhm resistor, built for high-cylinder-pressure, high-boost engines where a standard plug would foul or misfire. The -8 heat range is a cold plug, so it suits tuned and competition engines rather than daily drivers. Compared with NGK's standard iridium plugs, it trades long service life and broad heat tolerance for fouling resistance under extreme load.
In stockShips from Canada · priced in CAD (CA$344.99) · duties may applyReturn policy
This is a box of four NGK Iridium Racing spark plugs, part number R7438-8. Each plug has an iridium center electrode tip over a copper core. The ground electrode is a slanted pin-type design with a platinum core.
The plugs have a flat seat, a 14.00 thread diameter and a 5/8 hex size. They come pre-gapped at .028 and have a non-removable nut terminal.
