Rocker arm shaft bolt size

Every SB LA factory cylinder head rocker shaft bolts are 5/16. Plenty of busted bolts out there because of messed up info in a service manual. IMO, look at the bolt, see what the diameter is and find a good reference for torque. Grade 5 and grade 8 bolts have different stretch properties, requiring different torque values.

Thats what i get for looking it up online. I thought 3/8 was a little big. Thanks for clearing that up for me.

Jake