All engine parts should be carefully inspected and dressed for smooth operation. Rocker-arm stud threads should be chased and the shanks dressed with a fine stone for smooth assembly. For smooth operation, Marvin suggests removing any nicks or rises in mating surfaces. Nicks create high spots on machined surfaces that can cause problems later. Marvin uses only ARP rocker-arm studs due to the extraordinary 190,000-psi tensile strength.