Bucc,

Making this sort of part is an excellent evening lathe project. I’ve gotten 1/2" steel hex from On-Line Metals, and made cylinder head bolts for an L-A RBM. (I had trouble finding "high head" hex bolts that look like the originals.) They came out pretty nice. The question now is whether I should leave them in acid with some steel wool for a couple of weeks to make them look like the rest of the motor…

Good luck with the project. Any motor you can get running is a good project.

Tom