What size injector is this?

I got my 2000 f250 7.3 with 326000 on her and My number 2 injector is failing so i am doing a compression check and was checking out the injectors and was wondering if they are stock or?

Top as1831551c1
Bottom. 55110044597

Any input would be greatly appreciated



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Really the only way to tell is have them flowed or pull one to see if it has a serial number from a builder on it.

Thank you i will pull it and see what it says

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Some injector builders engrave the hold down bracket.

Billy T.
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