There was a member that came on with some pictures of his A14 crank that had been polished, etc. & compared it with another A14 crank that was heavier in construction & weight. This extra weight did not add to the strength, just the weight.
Both cranks were regarded as 'good', but for performance applications, the lighter one was regarded as 'better'
I do not recall if one was cast or not.

EDIT
Ahhh, there they are.


This is a link to that thread.