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This is from 1949-53 Mercury parts book.
1CM-6333-B (Red Size) crankshaft dia 2.498"/ 2.499 (Std)
Block main Bearing Bore 2.675"/2.671" (Std) Overall Length
1.49"/1.506" (Std)
It shows the same dimensions for 1CM-6333-C (Blue Size)