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A 228347504
If that is an A prefix in front of the 228 engine's serial number, the A designated that the cylinder was over-bored by 0.005" from the factory; and, the rod and main bearing journals were ground -0.010"
The A51 might be a date casting code:
A = January
5 = 5th
1 = 1941 (or 1951)
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