Alliant Power DTech DT660021 is a new injector and return line kit for the GM 6.6L Duramax LB7. The maker lists it for 2001 to 2004 Chevrolet and GMC pickups and 2003 to 2004 Chevrolet Kodiak and GMC TopKick C4500 and C5500 trucks with the LB7.

Each kit holds four DT660019 injector installation kits (two external o-rings and one nozzle washer each) and one DT660020 fuel return line kit (four banjo washers and one return line connection banjo washer). That covers four injectors, so a full engine takes two kits. DT660022 adds a rocker arm cover gasket, and DT660026 also adds the valve cover grommets and injection line oil seals.

Specifications

Fits / Applications

• Chevrolet and GMC pickups with the 6.6L Duramax LB7, 2001 to 2004
• Chevrolet Kodiak and GMC TopKick C4500 and C5500 with the 6.6L Duramax LB7, 2003 to 2004

In the Box

• Four DT660019 injector installation kits, each with two external o-rings and one nozzle washer
• One DT660020 fuel return line kit: four banjo washers and one return line connection banjo washer

Part Numbers & Cross Reference

Frequently Asked Questions

How many DT660021 kits does an LB7 need?

Two. Each kit covers four injectors, one bank.

How is DT660021 different from DT660022 and DT660026?

DT660021 has the injector seals and return line washers only. DT660022 adds one rocker arm cover gasket. DT660026 adds the rocker arm cover gasket plus twelve noise isolator grommets and four injection line oil seals.

Does DT660021 fit a 2004.5 or later Duramax?

No. The maker lists it for the LB7 only. The LLY, LBZ and LMM take the DT660024 injector kit and the DT660023 return line kit. 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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