Something I just found (US).
https://www.ebay.com/str/texas3dcutsoms?_pgn=1
Texas 3D has a pretty nice selection of printed resin engines and bits for 1/32nd, 1/25th and 1/24th scale to 1/18th scale models. "Printed Resin" meaning you will need super glue (CA) or epoxy for assembly. For the more adventurous builders, you'll also want a set of micro drills and brass or alum. rods or tubing to pin the parts together and make the glue bonds stronger.
Make note of the modern diesel engines for semi trucks.
Just a quick update. Check each item for the scales that can be ordered. Many of them are available from 1/32nd scale up to
1/8th scale. (Oh, Marcus...)
If you're looking for something different to build, how about just a 1/8th scale Offy racing engine?
