PowerPipe Exhaust for slant/6
sorry to jump in here but I have a simple question. on the bottom of the manifold there is a square hole, I was wondering do you seal the hole with a metal plate or something? what is that opening? I don't want any fumes or anything being release out. I have a project 1973 Plymouth Scamp Slant six and change the exhaust manifold with headers. thanks guys and great Powerful Engine with headers you have there mister twister.
