Cylinder Works Cylinder Head Stud Bolt Kit CWBLTK01O. E. M. cylinder bolts are torque to yield, which means they cannot be used for more than one engine disassembly assembly procedure, but with the Head Stud Bolt Kit you can perform multiple engine assembly disassembly procedures without having to replace the cylinder studs after each procedure. High strength steel allows for a higher fastening load of cylinder head to cylinder to help prevent head gasket leakage Black oxide coating added for