I have my 462's ready for the shop again to install head studs for my roller rockers. I see they come two differnt ways, a 7/16 bottom, and choice of 7/16 or 3/8 top (or rocker side), is there any difference in them other than the obvious 7/16 size is bigger and stronger? Like interference problems. No I have not bought my rollers yet obviously. Thanks. The new baby is due in two or three weeks, and Im tyring to get as much done before I'm sidelined for awhile.