NGK Iridium IX LTR5IX-11 Spark Plugs for C7 Corvette Grand Sport LT1
NGK Iridium IX LTR5IX-11 spark plugs, stock number 4344, fit the 2017–2019 C7 Corvette Grand Sport with the LT1 6.2L naturally aspirated engine. This offer includes eight spark plugs supplied as two packs of four.
Give your Grand Sport’s naturally aspirated LT1 a consistent set of ignition service parts. Fine-wire iridium firing tips support stable ignition and resist electrode wear, with all eight plugs included for a full V8 replacement. The corrosion-resistant plating helps protect the threaded shells for future removal. For coupe or convertible maintenance, you can order the complete plug quantity together and inspect the separate ignition components during the same service.
Product Details
- NGK stock number: 4344; design code: LTR5IX-11.
- Fine-wire iridium center electrode: A durable firing tip designed to maintain a consistent spark.
- Eight spark plugs: Two manufacturer packs of four, enough for one V8.
- 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
- One complete plug order: Replace all eight plugs with a matching Iridium IX design.
- Durable firing tip: Iridium resists electrode wear while supporting stable ignition.
- Service-friendly protection: Plated shells help protect the threads when your LT1 is due for its next plug change.
Important Notes
- Grand Sport fitment: Covers the 2017–2019 C7 Grand Sport with the naturally aspirated 6.2L LT1, in coupe or convertible form. Both manual and automatic transmissions are covered.
- Service planning: Keep the LTR5IX-11 and 4344 identifiers with your Grand Sport’s maintenance records. For a modified LT1, confirm the required plug specification with your engine builder or tuner.
- Check before fitting: Confirm LTR5IX-11 and 4344 on the plugs and packaging, then inspect the ceramic insulators and electrodes for damage.
- Installation gap: Use 0.044 inch for this stock LT1 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. Any adjustment must move only the ground electrode without levering against the center tip. Ask a qualified installer if a large adjustment is needed.
- Dry threads and correct torque: Do not add anti-seize or lubricant. Follow the vehicle’s tightening specification so the plug seats correctly and transfers heat as intended.
CORVETTE COMPATIBILITY
- 2017–2019 C7 Corvette Grand Sport
- LT1 6.2L naturally aspirated engine, stock configuration
- Coupe and convertible
- 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 4344 LTR5IX-11 Iridium IX spark plugs for your C7 Corvette Grand Sport LT1? 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.
