How to determine EXACTLY where TDC is?, Valve adjustment advice needed Options

[JeffBowlsby]

Eyeballing alignment of the rotor to the tick mark on the dizzy body seems so imprecise...for adjusting valves. Is there a method of locating TDC for each cyl PRECISELY?

1. I thought about making some kind of rotor replacement device with a pointer that could extend down close to the tick mark, but thats only good for cyl 1. All cylinders needed.

2. I thought about making a special trigger point plug adapter with three long wires, and attaching it to me DVM on the buzzer setting. When the trigger points would make contact, then that would indicate...? I am not sure that the trigger points make contact at TDC, I think it is at some different point in the cycle.

Any time proven methods?

[McMark]

On a running car you can use the rotor to determine you're close to #1 TDC or #3 TDC. Once you're close to #1 TDC you need to look into the inspection hole in the fan housing for the 0* timing mark.

The 'notch' on the distributor is more for getting the static timing close when you're installing a new distributor or have otherwise 'lost' your timing settings.