No need to hit tdc exactly. Think about it. The cam that is opening the valves is in fact entirely circular and regular except for the lobe itself. As long as you are not on the lobe the clearance is the same everywhere. So just get close and you are fine. Basically as long as the push rods are loose you are not on the lobes.
Finding TDC for valve adjustment
in Technical Topics
Posted
No need to hit tdc exactly. Think about it. The cam that is opening the valves is in fact entirely circular and regular except for the lobe itself. As long as you are not on the lobe the clearance is the same everywhere. So just get close and you are fine. Basically as long as the push rods are loose you are not on the lobes.