The material I used for the rocker pivots was purchased from McMaster-Carr. I chose some 3/32" precision ground 316 stainless shafting, P/N 1263K37, that was 0.0002" undersize. Two 36" pieces should be enough to make the pivot pins and all of the pushrods.
Finally, a simple part. However, the size does make it a little difficult ot work with. After using my parting tool as a work stop, I'm getting ready to part of a 1/2" piece.
20 pieces later, and I can add a 15°x0.050" chamfer to one end of each of the pins. After this, the only thing left to do was a quick deburring with some 3000 grit paper.
Here are a few of the rocker pivot pins and rocker arms ready to be assembled.
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