JIMS, rocker arm shaft kit & hardware for M8

Precision machined from a low alloy nickel, chromium, molybdenum case hardened steel. Offers .0005" paralell tolerance on the flats of the shafts. Complete with a special stud & nut kit from 4130 steel for precision 'torque steady' installation of the rocker arm shafts. Perfect for performance applications with increased spring pressure. Upgraded replacement for the OEM 17300053 (front exh, rear int), 17300055 (front int, rear exh) and 17300059B (set).