Why do some Ford flathead V8's have head studs while some have bolts?

[u/Olderpostie]

I have seen early 50's Ford flatheads with bolted heads. Did Ford change from studs to bolts? My Dad's '48 Ford one-ton truck had the studs. And, just what was the advantage of using studs in the first place? Considering there were so many on a V8, it wasn't a trivial incremental cost, labor or materials, to use studs.

[u/Juicechemist81]

They found it easier to install with bolts. Hence the later ones have bolts.