Fathead cylinder head locater stud. These locater studs make dropping a cylinder head on a BAE block with Fat heads a simple effortless job as they locate the heads to the block and line everything up. Made from heat treated steel and black oxide finish. Quick to install with a large flat blade screwdriver installation slot. Threads are 7/16-14 and the stud has a shoulder that is .437" for the cylinder head to register on. Studs are sold each.