IVONNEY Diesel Glow Plugs 9G 8‑Piece Kit for 6.6L Duramax LBZ/LLY/LML/LMM — OE Fit, Faster Cold Starts

These 9G-style glow plugs provide the preheat required by diesel combustion chambers so cold starts are faster and each cylinder maintains consistent ignition. They are supplied as an 8-piece kit that replaces OE part numbers 12639701 and 97364968 and are designed for compatibility with many Chevy and GMC heavy-duty trucks and vans built on the 6.6L Duramax platform.

Which vehicles are compatible with these glow plugs?

This IVONNEY kit fits GM 6.6L V8 Duramax engines labeled LBZ, LGH, LLY, LML, and LMM used in specific Chevy and GMC models between 2006 and 2016. Confirm fitment by model and year before ordering, and provide your VIN to the seller if you need a precise lookup.

• Chevrolet: Express 2500/3500 (2006–2016), Silverado 2500/3500 HD families (2006–2016)
• GMC: Savana 2500/3500 (2006–2016), Sierra 2500/3500 HD families (2006–2016)
• Replaces OE numbers 12639701 and 97364968; 9G style used by dealers for this era

How do these 9G glow plugs improve cold starts and drivability?

Glow plugs warm intake air inside the combustion chamber so diesel fuel ignites more reliably during start-up, especially in low temperatures. Properly functioning plugs reduce misfires, rough idle, and excessive starter engagement.

• Preheats each cylinder to support consistent ignition during cold starts
• Helps maintain smooth idling and throttle response when glow plugs are healthy
• Self-regulating design limits current draw to prevent overheating

What are the build quality and installation considerations?

IVONNEY glow plugs are aftermarket parts manufactured to meet or exceed OE performance and durability standards. They are intended as direct replacements but professional installation is recommended to ensure correct torque and electrical connections.

• Constructed for long service life and consistent heating performance
• Sold as an 8-piece set for a full V8 cylinder complement (one per cylinder)
• Installation tips: remove and replace one plug at a time, clean contacts, ream holes if needed, torque to spec

What does the warranty and packaging include?

The product ships with eight IVONNEY 12639701 glow plugs and is covered by a one-year warranty for defects or premature failure. Reach out to the seller with vehicle details or VIN if you need fitment confirmation or warranty assistance.

• Package contents: 8 pcs IVONNEY 12639701 (9G style) glow plugs
• One-year limited warranty with seller support for failures
• Professional installation recommended; no step-by-step instructions included

Who is this for: This 8-piece IVONNEY glow plug kit is aimed at owners, mechanics, and fleet managers running GM 6.6L Duramax (LBZ, LGH, LLY, LML, LMM) engines in Silverado, Sierra, Express, Savana, and other heavy-duty models from 2006 through 2016 who need a reliable, dealer-style 9G replacement set for improved starting and consistent cylinder ignition. If you maintain diesel trucks and require parts that match dealer specifications for the 9G glow plug style, this set is designed to meet those needs.