yes you can do that they sell a kit with a 7/16 top and 3/8 bottom stud for the rockers and a thicker rocker ball for the 7/16 stud .when i do the 5 /6heads i drill and tap the to a 7/16 old big block rocker stud and use stock old mark 4 rockers or rollers the kit you need they have it at www.competitionproducts.com