For Big Block Fords specifically, these 7/16" stud girdle adjusting nuts are threaded through the full length.
Stud Girdle Adjusting Nut Set for Big Block Ford w/ 7/16" Stud
Girdle Adj Nut Set Big Block 7/16" Stud
4511-16 - Stud Girdle adj Nuts, 7/16
COMP Cams Stud Girdle Adj Nuts 7/16
Engine Rocker Arm Adjusting Screw
Stud Girdle adj Nuts, 7/16
RockerArm Adjt Screw
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