PART NO.  SPL.PAGE  DESCRIPTION                                                           
51K894    15.A.1    Stud for main bearing cap (6) -(cyl.block, engine unit, 1500)
51K894    15s.A.1   Stud -main bearing cap (6) -(block assy, engine unit, sup)
51K894    16.A.1    Stud -main bearing (6) -(cyl.block, engine unit, 1600)
51K894    16.A.21   Stud -main bearing (6) -(cyl.block, engine unit, 1622)
51K894    TC.A.1    Stud for main bearing cap (6) -(cyl.block assy, engine, Twin Cam)

51K894 - Stud - for main bearing cap (6) -(engine.block1500, 1600, 1622, 1800, Twin Cam, ZA+ZB Magnette)
Length: 3-1/2" ?
Top end thread: 1/2-20-UNF x 1"
Bottom end thread: 1/2-16-UNC x 3/4"

High Strength Stud

Alternate part numbers: 328-930 (Moss Motors USA)