How do I identify a GMC 6.6L Duramax injector?

Replacing your 6.6L Duramax injectors? Having trouble identifying which injectors you have? Please see the images and information below for guidance on ordering the correct injectors for your engine.

Injector Bodies:

0986-435-520, 0986-435-521, & 0986-435-504

The 0986-435-520 and -521 injectors have a chamfer cut below the mounting flange. Look at the arrow on the pictures below and compare with the flat mounting flange design on the -504 injector.

0986435520 and -521 Injector Body

0986-435-520 & 0986-435-521
Injector Bodies

0986435504 Injector Body

0986-435-504 Injector Bodies

The connector keying is different between the 0986-435-520 and 0986-435-521 injector. Look at the key configuration of the connector in the pictures below..

0986435521 Injector Connector

0986-435-521 Connectors

0986435520 Injector Connector

0986-435-520 Connectors

0986435504 Injector Connector

0986-435-504 Connectors

For more help or information identifying your injectors, please contact our team at 800-658-9333 or ecominfo@mddistributors.com. You can also shop online at www.mddistributorsstore.com.

Jimmy Finch

Dallas Branch Manager, M&D Distributors

Jimmy Finch has over 33 years of experience in Diesel Engine Sales, Service and Repair. His experience started early in life at Texas Fuel Injection Service (an early acquisition of M&D) as a job with a means to an end. Somewhere in that 33 years this job turned into a fulfilling career. He started in the injector clean up department and has held practically every position leading up to his current role as Branch Manager of the Dallas, Texas location.

In his spare time, Jimmy enjoys spending time with his wife of 24 years, Priscilla. They are currently getting ready to make their way into the empty-nesters stage of life. He also enjoys the occasional hunting trip with friends and family and chasing down potential customers by the names off their trucks.

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