This link will take you to a site that has everything you need to know about rebuilding Kohlers. And he also talks briefly about other engines.
gardentractorpullingtips.com/engine.htm
I've looked through "most" of it and it all looks good. Gives great information, different numbers, cylinder sizes, ect. Go check it out. Hope this helps you if your rebuilding a Kohler in the future. If you have any questions I'll be glad to answer them. Just send me a PM.