As most race engines are now of the four-stroke multi-cylinder variety, the vast majority of con rods designed and manufactured for racing are of the split type. This means having a reliable means of holding the two parts of the rod together with sufficient pre-load, and this is taken care of by threaded fasteners. There are two options here. The first and most common method is to use a bolt. The second is to install a stud, usually into the rod, and to provide the load by tightening a...