![]() That is probably the reason why our experiences here in Oz with dropping military engines into cars is so different from the anecdotal information about this swap from your end of the world. In every other respect, they were a car engine. The only visual difference was the additional shallow (about 3/16 inch deep) flat "rib" castings on the ends of the cylinder blocks. This engine was all but impossible to differentiate from the outside from the '37 series 75 engine that came with my Iowa car. My '37 75 series originally came with a "tank" engine in it (the 3F4952 engine I referred to in my earlier post). ![]() Some more thoughts on the "tank" engines. Regards and good to see you are back focused on Caddies again! I still have some material to check about the four engine numbers in the two M24's that came here for testing towards the end of the war for the British War Office (the tests were held in QLD and in the jungles on Bougainville Island where my Dad spent the end of his war service) but I think they were, from memory, 3G or 4G engines. I have a feeling that post-1942 the military engines were changed substantially and the engine numbers were moved to the front (fan end) of the block. I am going to have a pretty good guess based on what I have been able to find to date that the "3" relates to the 75 series of the flatheads of this time and the "F" to 1941 (with "A" the first year of use of the monoblock in 1936, "B" 1937, "C" 1938, "D" 1939, "E" 1940, "F" 1941 and "G" 1942. My "tank" (there were thousands of them bought to Oz for the various reasons Steve describes) is 3F4952. The "tank" engines did have serial numbers as indicated in the attached extract from the US War Department Maintenance Manual.
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