New Melling rocker arm stud.  This is a 3/8" press in stud (+.003").  .373" width at bottom, 3/8"-24 nut thread, .700" thread length, 2.500" overall length. Replaces GM# 3814692.  Studs are sold individually.  Universal Small Block Chevy applications, 305, 307, 327, 350. 

NOTE : Press-in studs are not designed to be used with performance camshafts nor high spring pressures.  If you have a performance cam or high spring pressures, you should convert your press-in studs to thread-in studs instead.