Peter,
The plans were sold on Littlelocos.com which no longer exists.
Here is a youtube link to the engine running
[ame]http://www.youtube.com/user/LittlelocosME#p/a/u/1/6zjg5KoWLYM[/ame]
I think this is the prototype engine and if you go to the profile of the poster "LittlelocosME" you can send a message to him. He was active on youtube as of 3 months ago.
This is the last known address that I have for him which may or may not be valid.
Todd
LittlelocosME
20864 Emerald Drive
Hagerstown
MD 21742-4405
USA
And the original description of the engine that I think you are talking about.
The LME-370 is a 0.70ci, 3-Cylinder, 4-stroke, model airplane engine. Plans Sets are now available, including 24 engine drawings, 5 tools and fixtures drawings, and 33 pages of detailed machining instructions all bound in an 11x17" set.
Hope that this helps.
Gail in NM