The engine builder did tell me that it will build up more pressure then my old 1600 and that i would need a breather box
I also did this with my big type 1 lump with no issues, I think @zed also did with his, As for Type 4 breathing I have no idea but this thread is about a Type 1 engine, all a breather box does is catch the oil mist over time, it's just more plumbing and for no real reason, they are bling
