Retapping BMW head bolts to 11mm

Video is showing how to retap the head bolt holes in a BMW engine from the stock M10x1.5 to M11x1.5 thread size. This will allow you to use larger head studs for an S54. This is meant for M50, iron block M52, and US spec S50 and S52 engine blocks. The block in the video is just and old m20 block that I use for mock ups and testing.