William hasn't responded since the 16th.
Reading his previous post and looking at his pictures, the rocker arms that broke are the ones that have new looking pushrods (#6 and #7). Looks like the previous owner was having problems. He did say, "I did soak the cylinders with penetrating oil and couldn't get the two stuck cylinders to move". Not good.
Everybody knows how difficult it is to help someone when the poster doesn't include vital follow-up information. It's like trying to play checkers when you can't see your opponent's move.
If it was me, I would make sure the engine will rotate (not run) and not hang-up for at least 30 seconds, using the starter motor. Once I was satisfied the rotation was normal, I would do a WOT (Wide Open Throttle) test. With the spark plugs removed and throttle open, see how much cylinder pressure is measured. This could be a situation of stuck and/or cracked piston rings.
