I'm not building a race engine with triple valve springs and 300 pounds of valve seat pressure, although I've built dozens of that type of engine. A stovebolt with original pushrod ends press fitted into a piece of stainless tubing will probably outlive my grandchildren with no issues.
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!