Official response from Horizon re Evo 160...
We do not have any information regarding retailers that may or may not still be selling this engine. Evolution has discontinued production of that engine, with no provided information as to why. Seems this is just one that ran its course and was not replenished.
You can still find some parts available at this link in the parts and accessories section.
https://www.horizonhobby.com/7-cylin...ngine-evoe7160
Kind Regards
Todd Product Support
Horizon Hobby, LLC