Geoff, the Aurelia drawing might be helpful just to understand better, compare and check if the measuring turns out "familiar". It is not easy to get correct measures out of a worn 60 year old part.Very nice work. Great to see.
What is the ratio of cam lift to valve lift on the Flaminia rocker arm? It’s 1:1.5 on the Aurelia. Let me know if you need the Aurelia rocker drawing to work with, sorry don’t have the Flaminia.
You are probably right, all kinds of discrete bearings may require a deep research before designing and then making them will be complicated and reliability will be questionable afterwards.I suggest option #2.
At Walt Spak's suggestion, I followed suit in my own way. Over-size hard chromed shafts, after a clean-up grind, then all ground to the same size, and honing bores to fit. A torque plate for honing the blocks is needed, or your engine will seize upon start-up (happily no damage besides a bent pushrod, easily replaced...). As you've noticed, there is a lot of pressure on the ends of the shafts, and there is a tendency to galling of the block to the shaft. I think the hard chrome against the forged blocks is a good match (modern coatings MAY help, but I don't know how they wear).
I thought about needle bearings and shell bearings, but it would require hardened surfaces for the needles, and the shells would require a lot of effort to make, and a material that would withstand the pressure better. Both too complicated, even for (a) Lancia.
A friend has/had a jig to grind Flaminia tips, made by Fred Delong, of Delong Cams. I believe it will come my way in the near future, and will share it with you if it happens. I believe the tips were nitrided, evidenced by copper plating I noticed, if I remember correctly. I am curious what the profile was.
Anyway, I'm interested in a set, depending on cost. Do you still have free flow thermostats and radiator ducts in stock (or even the drawing for the ducts)?
That is a really nice looking engine. Albeit the 813.00 is of interest for Flaminia Berlina 1st series only. Heavier flywheel, smaller inlet and exhaust valves each with single spring only, weaker rockers . . . all missing here. Anyhow, the heads are accordingly, smaller ports for inlet and outlet.