IVONNEY Diesel Glow Plugs 9G 8‑Piece Kit for 6.6L Duramax (2006–2016) — Direct‑Fit, OE Replacement

These IVONNEY 9G diesel glow plugs (part 12639701) are an 8-piece aftermarket replacement set designed to restore reliable cold starts and consistent preheat performance for GM 6.6L Duramax engines from 2006–2016.

Engineered for compatibility with LLY, LML, LMM, LBZ and LGH Duramax variants, this kit replaces OE 12639701 (also referenced as 97364968) and supplies the full set of glow plugs required for a complete cylinder-by-cylinder refresh. Each plug is manufactured to meet or exceed original-equipment expectations for fit, durability and heat output, making them suitable for work trucks and heavy-duty vans commonly used in towing, hauling and commercial duty.

Will these glow plugs fit my Chevy or GMC 6.6L Duramax?

Yes — these IVONNEY 9G glow plugs are specified for GM 6.6L V8 Duramax engines across many model years and trims. Confirm compatibility by checking your engine code (LLY, LML, LMM, LBZ, LGH) or by matching the OE part number 12639701/97364968.

• Fits Chevrolet: Express 2500/3500 (2006–2016), Silverado 2500/3500 and HD variants listed
• Fits GMC: Savana 2500/3500 (2006–2016), Sierra 2500/3500 HD and classic models listed
• Replaces OE numbers: 12639701 and cross-reference 97364968

How do these 9G glow plugs affect starting and driveability?

Glow plugs preheat combustion chambers to improve cold-start ignition and stabilize idle until the engine reaches operating temperature. Replacing worn or failed glow plugs can reduce white smoke on startup, improve throttle response in cooler conditions and help avoid misfires linked to incomplete ignition.

• Provide quicker, more consistent cold starts
• Maintain ignition across all cylinders to improve throttle response
• Self-regulating design helps prevent overheating of the element

Are these plug replacements easy to install and durable?

The IVONNEY glow plugs are built as direct-fit aftermarket replacements intended for professional or experienced DIY installation. They are designed for long service life and to withstand the thermal stresses typical of diesel combustion, but professional installation is recommended to ensure proper torque and electrical connections.

• Direct replacement form factor for straightforward fitment
• Durable construction to meet or exceed OE performance
• Sold as an 8-piece kit to replace all plugs in a V8 cylinder head

What should I know before buying and installing this kit?

Confirm vehicle fitment by engine code or VIN if unsure, and plan to replace plugs one at a time to avoid contamination of adjacent cylinders. The package contains eight glow plugs; connectors, boot hardware or detailed instructions are not included, so have basic hand tools and a torque specification handy.

• Package includes: 8 x IVONNEY 12639701 (9G) glow plugs
• One-year limited warranty — contact seller for support if a plug fails
• Professional installation recommended; verify fit with VIN if uncertain

Who is this for? This IVONNEY glow plug kit is intended for owners and mechanics of Chevrolet and GMC trucks and vans equipped with the 6.6L Duramax V8 (years 2006–2016) who need a complete set replacement. It's a practical option for fleet maintenance, roadside repair shops and owners who want an OE-style 9G upgrade or replacement to restore reliable cold-start performance and consistent combustion across all cylinders.