I'm a 1953 model so that was going to be my excuse if I was wrong.....
I actually got flown down to Tasmania by Cummins way back in the 70's to spend 6 months completely reconditioning 6 x NHRS engines that were used as pump and winch engines on a Bass Straight Oil Rig.......I still have the H NH Shop Manual dated 6/73 that I was given so that I had all the specs on hand to do the job.
Very solid no frills engines.......glad I could be of help.
Newto