Frame and Engine Numbers (at start of production year)
1961: Frame: B40-101, B40 Engine: B40-101
1962: Frame B40-3511, B40 Engine: B40-3601, SS90 Engine: B40BSS-101
1963: Frame B40-5017, B40 Engine: B40-4506, SS90 Engine: B40SS-180
1964: Frame B40-6668, B40 Engine: B40-5275, SS90 Engine: B40SS-426
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