I have removed the seized exhaust studs and broken EGR tube fitting on the exhaust manifold with a lot of patience and heat cycles with the oxy/acetylene torch.  I will not be using the EGR valve and would like to thread a sealing plug into the manifold.  The thread size on the fitting does not look like a common thread size.  Any suggestions before sending the manifold to get bead blasted and then I will be priming and painting it with the VHT exhaust paint.  EGR block off plates are easy to fi