There is another way to gain another port on that back cylinder. Engines where the port in the head was being used had a plate on the back of the block for the air compressor outlet. You remove the rear freeze plug and mount the plate there. I may have one of those laying around somewhere. The main part is Cummins 3925226, the 1/2" pipe plug in the back is 3008468, the 2 bolts are 3910495 which are M12x1.75x30 flange head (2 req), and the sealing O ring is 3910530. The issue with that part could be it won't clear certain engine adapter plates. The ones found on the industrial engine that had this part were SAE3. The Ford or GM plates may have a hump sticking up that would block using that part. I never test fitted it on one so don't know. Also, if engine to firewall clearance is tight that may not work either. Part is about 1.5" thick or a tad more.
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