Hiya, new to this forum and I've got an issue I can't work out, changed the engine on a vts and the head is slightly different to the old engine. This one has a 2 bolt hole in that has pressure coming through when started. Sounds like an exhaust blow. What is supposed to go into this? It's not the hole in the cam cover which I know is the breather back to intake. It's at the front right hand side ofnthr engine above the gearbox.

Hope the photo works!
Thanks in advance
Kyle

Hope the photo works!
Thanks in advance
Kyle