The Alliant Power AP55116 is a remanufactured fuel injection system kit for 2001–2004 GM 6.6L LB7 Duramax applications, including Silverado/Sierra HD pickups and 2003–2004 Kodiak/Topkick medium-duty trucks. Alliant describes it as providing the replacement components needed to service the fuel injection system and restore proper fit and function.

Features & Benefits

• Remanufactured Alliant Power Fuel Injection System Kit (Alliant P/N AP55116)
• Fit, form, and function tested to meet or exceed original-equipment standards (per Alliant Power)
• Direct replacement for 97208074 / 97720604 / 97720661
• Backed by Alliant Power’s 24-month, unlimited-mileage warranty

Application

• Chevrolet Silverado 3500 / Silverado 2500 HD (2001–2004)
• GMC Sierra 3500 / Sierra 2500 HD (2001–2004)
• Chevrolet C4500 Kodiak / C5500 Kodiak (2003–2004)
• GMC C4500 Topkick / C5500 Topkick (2003–2004)

Always verify fitment against your VIN, engine, and OE part number before ordering.

Cross-Reference / Replaces

• General Motors: 97208074, 97720604, 97720661, 97729095
• Bosch: 04451200008, 0445120008, 0986435502
• Isuzu: 2-90000-913-0, 2-90071-300-1, 9772060661
• Alliant Power: AP55116

Warranty: Alliant Power’s standard warranty: 24 months with unlimited miles/hours on installed parts (Alliant Power warranty policy, rev. Aug 2025).

A refundable core charge is added at checkout and refunded when your old injectors are returned per our core terms.

Kit Contents:

• (4) Injector O-Rings
• (4) Fuel Injector Lines
• (1) Rocker Cover Gasket
• (4) Fuel Injector Copper Washers
• (4) Fuel Injector Return Banjo Bolts
• (1) Valve Cover RTV Silicone Sealant
• (4) Alliant Remanufactured Fuel Injectors
• (4) Fuel Injector Return Line Banjo Washers

Note: Must Purchase 2 kits to do both engine banks.