Clive ,
remember a 400/401 was developed in the late 40's in England.
All the threads used by Bristol were BSW , BSF , BA and a few special threads , but are all British threads/forms .
UNC &UNF are American or Canadian threads , used on the Chrysler engines & auto in the Bristol V8 cars . I'm not sure about the threads of bolts and screws used in the suspension and body of the V8 car.
Geoff
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