Our third model - the "Flat flathead" - is ready for production. Since I have been doing flat engines, I had to do a flat flathead. This engine is based on the older Briggs & Stratton vertical shaft flathead lawnmower engines of the past. The only major rearrangement to make it flat enough to view was to split the cam shaft in two, and put one on each side of the cylinder. This is a fun little project with about 50 parts. Total size is about 10.5 by 10.5 inches.