Alliant Power DTech DT660023 is a new injector return line kit for the GM 6.6L Duramax LLY, LBZ and LMM. The maker lists it for 2004.5 to 2010 Chevrolet and GMC pickups, 2004.5 to 2009 Chevrolet Kodiak and GMC TopKick C4500 and C5500 trucks with the LLY or LMM, and 2006 to 2010 Chevrolet Express and GMC Savana vans with the LLY or LMM.

The kit has one return line hose, four return adapters, four adapter o-rings and four clips. GM’s own kits are made for one side of the engine. This kit fits the injectors on either side, so a full engine takes two kits.

Specifications

Fits / Applications

• Chevrolet and GMC pickups with the 6.6L Duramax LLY, LBZ or LMM, 2004.5 to 2010
• Chevrolet Kodiak and GMC TopKick C4500 and C5500 with the 6.6L Duramax LLY or LMM, 2004.5 to 2009
• Chevrolet Express and GMC Savana vans (GM G van) with the 6.6L Duramax LLY or LMM, 2006 to 2010

Part Numbers & Cross Reference

GM 97328733  ·  GM 98062291

In the Box

• One return line hose (the maker notes the hose may be red)
• Four return adapters
• Four adapter o-rings
• Four clips

Frequently Asked Questions

Does DT660023 fit the left or right side?

Either side. GM’s kits are made for one side, but this kit fits the injectors on either side. Use one kit per side, two per engine.

What is in the DT660023 kit?

One return line hose, four return adapters, four adapter o-rings and four clips. The hose may be red.

Does DT660023 fit an LB7?

No. It is listed for the LLY, LBZ and LMM only. 2004 trucks came with the LB7 or the LLY. GM’s VIN engine code is 1 for the LB7 and 2 for the LLY.

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