i have a 7.3 idi turbo does anyone know the correct letter that should be stamped on the injector the ones that came out had an x and d they are bad i put some rebuilt ones in with a D stamped i heard the letters are for the amount of fuel shot to to the engine is this right

 

Moved here for better exposure.

 

still tryin to figure website out i not too computer friendly

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sorry dont know if you were talkin to me