Big Parts Not Running Touched Script when Touched by other Parts

When a Part that right now I have at 400, 150, 400 Size Wont Run Touched Script on Parts (I’m trying to Make it Do so). is there Anyway to Make it Do so Or do I need to Make like 1M Small Hitboxes and put it over The Main Object :confused:

What are you trying to do ???

Make Rising Lava Destroy Buildings