I need help. I got a new engine with 500 miles on it. Installed in and had some problems. It has the flapper mod, Pair removed with block off plates. What is happening is the crankcase is building pressure and it first blew out the seal around the front pair blocker plate. Re sealed it and i checked the breather and it was free no kinks or anything. Started ran for 30 min and it blew out the stator cover gasket and while running i can feel air coming through the hole it blew in the gasket. My question is if the o ring between the head and valve cover on that dowel is bad will it cause it to build a lot of pressure? After that second ride there was about a inch and a half of oil in the pink breather tube.