Re: REALLY finding TDC???
use a piston stop to find the actual true TDC.
without the heads on, bolt a piece of angle iron with a bolt in the middle across the top of the cylinder so the piston will hit it as it comes up.
gently crank the motor over one way until it hits the stop- and mark the balancer or write down the number on the degree wheel.
then, turn it the other way until it hits the stop, and mark the balancer or write down the number.
true TDC is exactly halfway between these two marks.
if the heads are installed, you do the same thing but with a stop screwed into the #1 spark plug hole.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?