I recently moved my thorley header from an 8v 1.3 to a 1.6 8v. There is a little pipe on the tube closest to the fire wall that sends exhaust back into the engine for some reason. The little pipe dos not line up exactly with the hole in the 1.6 block and creates a little leak. Has anyone ever experienced this and what did you do? I am running a stock tracker gasket if it matters