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?

[realred914]

for adjusting valves you dont need to be very percise on the cam location, so long as your lifter is off the lobe, your ok to make a valve adjust. near half the cams rotation is over a no lobe zone, for any given valve, so you have nearly +/- 90 degree of cam rotation tolerance for your valve adjustment location. (atcually it may be a little less than 90 degrees due to the width of the lifter) but at anyrate there is a big zone of cam rotation that is acceptable for valve adjustment locations

Using the rotor to eyeball it is close enough in most cases.