A rocker stud that wobbles going into the head threads never seats straight, and once that happens the rocker geometry is off before the engine even turns over. These studs run in true every time and are heat-treated to hold up under a big block's spring pressure.

AFR 6407-16 Screw-In Rocker Studs Features:

• Fits big block Chevy intake and big block Ford rocker positions
• 7/16 in.-14 base thread
• 7/16 in.-20 rocker nut thread
• Premium-grade chromoly steel
• Heat-treated for tensile strength
• Exact stud lengths for positive seating
• Set of 16