In Reply to: block test posted by lonestarjeff on August 14, 2018 at 23:32:32:
If your not losing coolant, I don't think your block test will reveal anything. Another consideration is that your overheating is not until your under a load. If you have a stress crack, it might not open until under load again.
So load it up and go warm it up. A good point for a stress crack can be found in the cylinder head between the valve seats. . .