NGK Iridium IX TR5IX Spark Plugs for C6 Corvette Grand Sport LS3
NGK Iridium IX TR5IX spark plugs, stock number 7397, fit the 2010–2013 C6 Corvette Grand Sport with the LS3 6.2L engine in stock configuration. This offer includes eight spark plugs supplied as two packs of four for a complete V8 plug service.
A complete plug service gives your Grand Sport’s 6.2L LS3 a matching replacement design in every cylinder. The fine iridium firing tip supports a stable spark with resistance to electrode wear. Together with a corrosion-resistant plated shell, that design gives you a matching set of service plugs for a stock-engine Grand Sport driven on the street.
Product Details
- NGK stock number: 7397; design code: TR5IX.
- Fine-wire iridium center electrode: A durable firing tip designed to maintain a consistent spark.
- Full eight-plug quantity: Two manufacturer packs of four for one V8 engine.
- Spark plugs only: Plug wires and ignition coils are separate components and are not included.
- Trivalent shell plating: Helps resist corrosion and supports removal at a later plug service.
Benefits
- A matching set: Replace all eight plugs with the same Iridium IX design in one order.
- Wear-resistant firing tip: Iridium supports stable ignition while resisting electrode wear.
- Grand Sport-specific ordering: Choose a set matched to the 2010–2013 LS3 coupe and convertible.
Important Notes
- Grand Sport model years: Match this set to a 2010–2013 C6 Grand Sport coupe or convertible with the stock 6.2L LS3. Confirm the engine configuration as well as the Grand Sport model designation.
- Body and transmission coverage: This offer covers both Grand Sport body styles with manual or automatic transmissions. One order supplies the eight plugs required by the LS3 V8.
- Check before fitting: Confirm TR5IX and 7397 on the plugs and packaging, then inspect the ceramic insulators and electrodes for damage.
- Installation gap: Use 0.040 inch for this stock LS3 fitment. Measure every plug before installation; the supplied gap is not a substitute for the vehicle’s required setting.
- Protect the fine tip: Use a round-wire or pin gauge. Move only the ground electrode if adjustment is needed, without levering against the center tip. Ask a qualified installer before making a large adjustment.
- Dry threads and correct torque: Do not add anti-seize or lubricant. Follow the vehicle tightening specification. An engine builder or tuner should confirm plug requirements for a modified engine.
CORVETTE COMPATIBILITY
- 2010–2013 C6 Corvette Grand Sport
- Coupe and convertible
- LS3 6.2L engine, stock configuration
- Manual and automatic transmissions
Why Buy from Custom Corvette Accessories?
At Custom Corvette Accessories, we’re Corvette owners ourselves, and we offer one-on-one customer service to help you choose parts for your car. Have a question about NGK 7397 TR5IX Iridium IX spark plugs for your C6 Corvette Grand Sport LS3? Contact us for personal help before you order.
✅ In-stock items ship in 1–2 business days via Standard Ground.
✅ Free shipping items are available in the Continental US only.
✅ Custom quotes available for 2-Day, Next Day, or Saturday delivery.
✅ Custom or backordered items ship as soon as available.
