Use for 351C & BB Ford heads which either already have 7/16" base threads or heads which will be machined to accept studs w/ 7/16" base threads.

Great for factory or aftermarket heads which are machined to accept screw in studs and guide plates.

NOTE- Most 351C and Big Block Ford heads use pedestal mount rockers. Pedestal mount rockers use a small 5/16" bolt to hold the rockers down. If you've got heads which have 5/16" bolt down pedestal mount rockers, your heads will need to be machined to accept 7/16" Base thread studs.

It's the buyers responsibility to verify their heads will accept this type of stud before purchase.