Hello Howard:
Accoring to Robert Neal Packard did not use SAE, but rather what was spec'ed by RR. This caused a lot of trouble as few machine shops in the USA even had the tooling to produce whitworth, BS and the like.
Over 200 Packard engineers and draftsmen were set to work on this project starting September 3, 1940. By early July 1941 they had the first hand-built engine completed (10 months) and by October 1941 (13 months) the engines were coming off the production line.
This is truly a remarkable feat as Packard also had to construct building #22 for the production line and a building immediately to the west where each engine was run-in before shipping.
See the attached pdf by Robert Neal.
And this may be helpful too:
tested.com/art/makers/492418-packard-mer ... ced-britains-hand-built-powerhouse/Attach file:
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