What do you think about this statement.........

TT5.9mag said
Yea but 5/16 is sufficient for what most people are gonna do.

I don't know. I never liked it. The rockers on my Ford 400 are held down with 5/16" bolts, but all it has is a small Crane Fireball hydraulic flat tappet. I "guess" maybe I'm just not giving enough credit to those aftermarket 5/16" fasteners.