I've solved all the mysteries associated with the drain plugs. One of the 5/8" plugs goes in the side of the engine to plug the hole for the timing mark and the other one goes for the drain plug on the oil tank. Except now, there is a third 5/8" plug and that one is for the engine oil drain. I fixed the threads in the case to accept the drain plug from the oil tank so I'll need to pick a new one of those up. It takes an "O" ring so it should seal up nicely without having to tighten it up very much. Just give the "O" ring a decent crush and it should be leakproof. I drilled it for safety wire so it won't be able to work loose even if it's not real tight.
I also put never seize on all the plugs as well. This prevents the threads wanting to gall and the galvanic action that occurs between aluminum and steel. Any time you stick a steel bolt into an aluminum case or cylinder head, if you don't grease up the threads you're just asking for trouble. Either that or bolt a sacrificial zinc to the side of your bike like you would on your yacht.
Anyway, the engine is in the frame and I can start assembling the rest of the engine. Pretty happy with that.
Also this is blog post number 1,000 for Shop Teacher Bob. Probably should have tried to post something of real importance to celebrate the event but since that rarely occurs anyway, why would today be any different. I'll just keep plugging away with misspelled words, bad grammar and syntax errors on subjects that I enjoy discussing. Thanks to everyone who stops by and gives a little of your time to listen to whatever it is I have to say.