Hello Mike, you could try Cole's Power Models. They have a website up so all you would need to do is do a search for them. Are you looking for the large 'traditional' engine or the earlier oscillating cylinder style? (there were two 'flavors', horizontal and a vertical version of the later) Cole's *should* have both the large and the early styles, as that is where I purchased my sets several years ago. Call them first for availability. There was another vendor of the castings as well, but I do not recall the name. Good luck in your search.
BC1
Jim
