Use a pry bar or a long, heavy screwdriver at the rocker arms to cycle the valves open and closed several times with a heavy dose of penetrating oil on the stems. Stovebolt valves are notorious for sticking and bending pushrods or breaking rockers when waking up a Rip Van Winkle engine!
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!