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The groove in the journal is there to ensure a higher oil flow to more of the journal bearing surface sooner. Many engines have this. It appears that even Alfa recognized that journal number 4 in these engines had a feed problem, judging by how many cranks have had bearing failure in this location. As learned in the old days, I still always warm up the 164 engines for a little bit at min revs before starting off from cold.
I do wonder why journal number 4 has this problem, and not the others to any degree. Something weird there.
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Del
Seattle
89 Milano
91 164S
94 164LS (Q)
72 Morgan 27
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