According to my Peter Russek "Pocket Mechanic":
Crankpin Diameters:

1700/1800cc:  2.1644-2.1653in.(54.98-55.00mm)
2000cc:  1.9677-1.9685in.(49.98-50.00mm)

Given the data you've presented, I think I'd go with Tom Wilson's for two reasons: 1) it's conservative and "inside" the other published specs 2) I trust Tom's book.

However, I did find the specs in my earlier Bentley (68-79). For the 72-75 engines, it's 54.98-55.00mm. For the 76 engine, it's 49.98-50.00. Other years are not specified.

Interesting discovery here, but we should remember that wear limits are simply guidelines for us. As we come in closer to tight, we can assume longer life of the component, given ideal conditions. As we move toward the outer limit, we are dealing with more used parts with shorter theoretical lifespan.

Good luck! Joe

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