Atomic Barra M14 Tool Steel Head Stud Kit

14.3mm 
H13 Tool Steel

Correct length - bottoming tip which can be trimmed down if the stud sits too high (apparently some castings have shallow holes by ~10mm)

H-13 Tool Steel 14.3mm Head stud kit suit BA-on Ford DOHC 6 cyl. Includes 12pt double hex nuts, 28mm oversize CRMO washe