i purchased a .12 TR engine for my stadium truck and noticed the head is kinda small. Im just wondering if any other head will work on this engine?

You have to use parts for the .12 TR.

I noticed in my TR manualthat i can get a head that fits the .12TR and 12/15cv-r series engines. Part No.72011000

Ok, we missed that one. It's an option, and wasn't listed in the stock parts list I had. It will fit. It will likely not give you much performance change, just affect cooling in some installations.