Answer 1. The size of the cam roller seems to vary from horse power size on the vertical engines.
2 1/2hp = 1.5", 5hp = 2"

Answer 2. Dupont Dulux 93-5316 Green, this color code is from a book by Charles H. Wendel called "American Gasoline Engines Since 1872" is was matched from original paint. If you have an engine with excellent original paint and can get an eye match or computer match by expert paint specialist, please let me know.

Answer 3. R&V made seven different models of gasoline engine.
The Horizontal Hit & Miss, Horizontal Volume Governed, Vertical Water Cooled, Vertical Air Cooled, Easycooler, Triumph Line R series, Triumph Line L series, Marine Engine

Answer 4. Mike Schlender in Wisconson at jolin.mary53@gmail.com ......... John Wanat KingpoleAC@aol.com 203-938-3771