Frank, you do not say whether the flathead is a runner or not. If the engine turns over and starts to run somewhat, the old transmission fluid down the carb trick might work. On older engines that have been sitting for awhile, it is not uncommon for things to gunk up. I have successfully got engines to loosen up by getting them on a high idle then slowly pouring transmission fluid down the carb. This tends to have a detergent effect. The sam ething works just before an oil change, especially if the motor is down on oil, add one quart of trans fluid to help degunk it. I do not suggest driving for a long period, although a few miles certainly doesn't hurt it.
Having said this, if you've got an old stuck engine without hope, the only direction is to disassemble the valves and clean them up. Flatheads can be notorious for sticking by their design, sitting long periods tends to allow the oil to flow away down into the bottom instead of staying at the top. Take your valves apart carefully, and in order one atr a time as they are worn to fit the guide and seat they ride in. You will need to make or obtain the special tool for pressing down the spring to be able to remove the retainers.
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