[van Dyck]

It would seem to me that the pre'22 engines using two separate covers that Ford engineers were not concerned with valve chamber ventilation, that the oil filler spout and cap was sufficient.
Yes, it never ceases to amaze me that these early engines had neither air nor oil filtering devices. I am also amazed at how relatively clean the Ford engines remained in service comparing them to the OHV Chevrolet 4 cylinder with their non-existent side cover!

I do have 3 other T engines to compare with, however, they are not accessible until the snow melts.

Thanks all for your responses.