Interchangable parts?

[TTV6VR4]

Will GTO engine patrs go into a 6A13TT engine (e.g. GTO pistons and valves into a 6A13 engine)?. I have found a place in Japan that deals in forged GTO pistons,valves and stuff like that.

[Nick Mann]

Don't know about valves, but the cylinders are different bores.