403 - PBM Performance - BBC - World Merlin Iron & O.E. Iron Heads - 1pc design - 7/16" Stud
Discontinued - Use PBM418 when stock is exhausted.
Stud Girdles help eliminate stud movement that changes valve actuation, due to flex and angle changes. PBM stud girdles are made from 6061-T6 aluminum for maximum durability.