Harmonic balancer

413 said
How do you know it’s truly on TDC right now?

The timing chain has nothing to do with the balancer lining up with the marks on the timing cover. All you need To find TDC is a block, crankshaft, #1 rod & piston, timing cover and balancer.

I'm wondering the same. He "says" he degreed the cam. If that's true, he had to find TDC, but he's not acting like he knows exactly what that is.