Alliant Power DTech DT660031 is a new fuel injection line for the GM 6.6L Duramax LB7. The maker lists it as the line for cylinders 2 and 7 on 2001 to 2004 LB7 pickups and notes it is for LB7 use only.

The maker numbers the LB7 lines by cylinder pair: DT660030 for 1 and 8, DT660031 for 2 and 7, DT660032 for 3 and 6, and DT660033 for 4 and 5. The LLY, LBZ and LMM use different lines.

Specifications

Fits / Applications

• Chevrolet and GMC pickups with the 6.6L Duramax LB7, 2001 to 2004: cylinders 2 and 7

Part Numbers & Cross Reference

Frequently Asked Questions

Which cylinders does DT660031 fit?

Cylinders 2 and 7 on the 6.6L Duramax LB7. The maker lists DT660030 for 1 and 8, DT660032 for 3 and 6, and DT660033 for 4 and 5.

Does DT660031 fit an LLY, LBZ or LMM?

No. The maker lists it for the LB7 only. For cylinders 2 and 7, Alliant lists DT660039 for the LLY and DT660043 for the LBZ and LMM.

I have a 2004 truck. Which line do I need?

Check the engine first. 2004 trucks came with the LB7 or the LLY. GM’s VIN engine code is 1 for the LB7 and 2 for the LLY. This line is for the LB7.

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