Machining a stovebolt engine for the full circle rear main lip seal isn't difficult to do- - - -all it takes is a couple of thousand dollars' worth of machinery and 50-something years of experience as an engine machinist. I'll be offering that service soon, once I get a couple more pieces of specialized tooling perfected and a shipping arrangement finalized with my local Fastenal store. Here's the seal:

https://www.zoro.com/skf-shaft-seal-3-78x4-34x38-crwa1-nbr-38647/i/G9397674/

Jerry



"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!