Should I check TDC?

[davepl]

Originally Posted by geezer#99

You still haven’t answered the question.
Likely because you don’t know.

If you want to be off 10-20 degrees on your timing, so be it.
It’s only a few holes in pistons.
No biggie.
It’s not your dollar being spent.

Your question made no sense. You said "How many crankshaft degrees does the crankshaft turn when the piston is at tdc?"

I don't even know what that means. I'd argue that the crankshaft turns 1:1 with the crankshaft.

If you meant cam, it's half the crank speed obviously. But by definition when something is at TDC it's not turning any degrees, it's sitting at TDC, so I still have no guess.