Hi Joe, you find the ends of the cracks and punch them and then drill them one hole at a time and ream the hole with a tapered reamer that matches the tap you will use and then tap it and follow the crack until you plug the complete crack, making sure that you overlap each pin with the other plug, no there is no welding with doing it this way, its called the cold repair, I still have to install seats in this head, I cant do that until I get the guides and then I will install seats and then do the valve job. I like a straight head so I milled the top and yes I did mill the surface side of the head the same way. I milled the top to make the rocker shaft straight when installed. The plugs are made of cast iron so when done right they will expand at the same rate as the head. I will mill the top of the block the same way. then both surfaces will be flat and head gasket will seal nicely.
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