There were a number of prototype and very low volume vehicles built with R975 engines. The most obvious being the original M8 High speed tractor (R975D4) and some of the very high mobility 8 x 8 trucks by Corbitt (T33 and T33E1)(R975C4). The fan in Bob's post #12 is a design that I have not seen before, with the blades braced to each other and the exhaust looks as if it has the outlets very low down compared to WW2 applications that had them right at the top or half way down each side.
One of the significant improvements with C4 cylinders was that the cooling fins were made much bigger with bigger gaps between them as the very fine fins on the EC2/C1 and presumably the -46 engines clog up with dust in tank applications.
David
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