Quote:
Good point. I simply use the term '1200' to denote the earlier engines from Datsun 1200 cars, & the A12 to denote the later [A12(a)] engines. Both systems would work, but only one of them should be universally adopted to avoid confusion between the earlier & later 1171cc [A12] engines.

Interestingly, both Ferals & my short stroke A13 engines use an 'A' as a suffix in the engine number, probably to separate these engines from the earlier long stroke A13's. This suffix is different from the A12A xxxxxx format as it is a suffix to the actual number itself,
ie, A13 xxxxxxA
Verrrrrrrry interesting.