MSD injector id

[2FAST4U]

I have a set of 6 MSD injectors that I am trying to id. The numbers on the injectors are 4239 and 17104988. I couldn't find anything on these on the MSD website. Any ideas as to what these flow and impedence (hi/low)? I'm trying to find out without having to get them flowed.

 

[2FAST4U]

I finally got in touch with the folks at MSD yesterday. These are 72# injectors like I had hoped.