[Bob Phillips]

Thank you gentlemen for your input and comments!
The idea of using a -46 in a tank is tempting but I think it has fundamental dimension issues because the crankshaft is significantly longer. Then the cooling shroud would have to be redesigned to the longer length, unless... you machined the front crankshaft shorter. I think it could be done ( will post c/s pics later). The engine in post #12 is probably intended for an automatic transmission vehicle (M18 ) and has no clutch. The cooling fan around the front shaft is for the oil coolers. I had one of these engines and (sadly) I let it slip away.
Here are some more photos the C1éC4 carb ( stromberg NA9RG) versus the much larger Stromberg QD 9A1 of the -46. Also magnetoes , two types used on the -46, the SF9RN which looks very similar to the C1 and C4 mag (VAG9DFA), and another type SF9RN-8 which was an automatic retarding mag.