Broken rocker stud help???

[1badlx1990]

I have broken two rocker studs in two weeks. I have a 306 with 351w heads, harland sharp roller rockers and a f303 cam. The studs are 3/8 base with 7/16 adjustable nut. The two studs both broke off in the adjustable nut. I'm going to replace all the studs as a first priority with ARP chromemoly studs. The breaks look like bad constuction of the studs. No damage to the rockers and the pushrods are not bent. Any other ideas why I might be breaking rocker studs???

 

[347HO]

Recheck for correct pushrod length. If the length is wrong, you'll still break ARP studs, and possibly take out your springs and rockers.

Recheck for coil bind.

Recheck your pushrod to rocker button to valvestem alignment.

All/some or one of the above will give you the failure you have. Replacing the studs and calling it good without rechecking everything most likely will cost you most of your topend.