Guys, who is able to confirm that there is no possibility to use GT3 heads in 997 TT engine.
I was running my GT2 with GT3 cylinder heads, but have no idea what is the problem on 997 tt engine.

Thanks.K

Why not just have your TT heads reworked(ported/polished, etc) at a fraction of the cost.. There are many good shops that can do it, Ron's in St Charles, Misssouri would be my choice.

I live in Europe so it's difficult to send the heads to U.S.
In Germany full modification of one item (incl bigger valves,springs etc) cost more than brand new and complete GT3 head.