Knock the porcelain center out of a spark plug, and drill & tap, or just weld a 2" long bolt into the plug shell. Install the modified plug in #1 cylinder and turn the crankshaft slowly until you reach a stop in both directions. Mark the stop points. TDC is exactly halfway between the two stop points.
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!