Procomp Heads : 2.02 Itake valve on stock pistons?

It all depends on the location of the valve in the chamber. Everyone knows that you can run a TW head with a 2.02" valve because of the way the valves are rotated in the combustion chamber, but you can also run a set of holley heads with the 2.02" valve on a stock shortblock, and their valves are in the same location as the stockers. The difference is the holley has their valves recessed up into the chamber moreso than the stock design. It does limit you on cam choise, but they will work. I don't know about the pro-comps and if they'll fit. I also don't know much about the in general, but from the very few threads I had read on them over on hardcore50 I don't think I'd run them on my car but I didn't read much. You will definitely want to research these heads a lot more before you buy them. Good luck!