Hello folks, I believe this topic has been discussed before, but not necessarily with a pictorial to accompany it. The other day the "kids" over in the diesel shop at our school decided to modify an intake manifold on one of their diesel engine trainers. Hence, the weld shop then becomes the rescuer. They busted a pretty good section out of one of the mounting hole passages. After looking it over I decided to use an old trick that was passed onto me by an "old timer", after some cleaning and prep. work, I inserted a stainless steel bolt into the hole and used it for a "form" to shape and maintain the passage while welding. I let them complete the job by drilling the hole back to size and concentricity and then spot-facing the repaired side. Here are a few pics to detail the process. Best regards, Allan