The cam bearings are the German INA HK6020 (front) and HK6012 (Some early blocks used the 20mm width on all, but the later use the 12mm for all except the front). They are for a nominal bore 68mm to fit the 60mm camjournals. In my first block I have measured the bores to 67,95mm, which gives 0.05mm press fit, and the cam runs just fine in these bearings.
The 67,95mm is 2.6752" calculated, and I think this is correct. My new block was machined to this size, and I did not need to change anything there.
The smaller number given here could be too tight. My
