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Eldon hit it on the head there... to find the tractor year really needs the tractor number. But your engine was built in 1951. I was suspicious of the 301xxx on the second number since it happens to be a common casting number (first 3 digits) on that engine model but the format (WD301xxxPA) does look like the engine number so the 301 must be coincidence. A lot of people have thought the 3019xx was the engine number but I think that's a casting number. Since there were often many times as many engines built as tractors with some models, it's not uncommon to find one has been swapped. Worse, In the WD case, the basic engine casting was in use for years with other units (combines, tractors, industrial and power units, e.g., a friend has a grader with the same engine) and that makes the tractor number and engine number way off. Near as I can tell, the first WD to roll off the line had an engine number up over 200000 so AC didn't start the series over from previous castings. They just stuffed the WD in front of the number and continued on in 48. Kinda interesting. The first number appears to be the block type. The second does look like a real engine number and if so is a 51. The tractor range you are looking for is a stamped WD followed by a number in this range, (1948) 7+, (1949) 9280+, (1950) 35471+, (1951) 72356+, (1952) 105216+, (1953) 131273+. These are shown in the "Serial Numbers" to the left under the Research & Info heading if you need a quick reference.
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