GSC Power-Division Exhaust Valve Guide for Toyota/BMW B58/S58

GSC Power-Division Exhaust Valve Guide for Toyota/BMW B58B30 And BMW S58 Standard sized sold as set of 12 or individually Oversized sold individually as 0.001″ and 0.003″ GSC3131 Standard (in/mm) Total Length 1.693 / 43 Outer Diameter 0.3948 / 10.03 Valve Stem Diameter 6mm Stopper Protrusion 0.650 / 16.5 Can be used with OEM Hat Style Seal or with a metal clad seal if a different spring seat is needed Stopper design to aid in quick install and to prevent valve guide dropping