This question is for Larry Bible:

You said I could use the piston at TDC to hold the valves from falling into the cylinder when replacing the valve seals.
Here's how I plan to proceed.
The #1 cylinder is easy, just go to 0 degrees on the engine balancer. The next cylinder in the firing order should be 72 degrees from 0 so I measure the distance on the balancer from 0 to 24 degrees (because the marks don't go to 72 degrees) and multiply be 3 then turn the balancer this far. I then repeat for the other 3 cylinders.
I got the 72 degrees by dividing 360 degrees by 5 which is the number of cylinders in engine.

Is this a practical and correct solution to putting the piston at TDC of the cylinder I want to replace the valve seals?

P E H