In 1971/1972 GM began using the “B” on the caps in the Z28 engines, in fact in 1972 I bought 2 replacement 69 Z28 rods and they came with “B” on them.
I also had a 72 Z28 short block back in 74 out of a 9,000 mile car and it had all “B” rods.
Later L82 Corvette short blocks had “X” rods with white and pink paint all over them.
I have a set of white/pink paint rods that actually have what look like “D” on them, not sure if it was a “B” that the forging die messed up or what.
Hope that helps.
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