427 S/O If you look at the picture you showed of the broken rocker, look how thin the area is where the bushings are. Billet or not. I don't have a side view of an Erson rocker but the bearing area is alot thicker that the Comp or Dove rockers you have. You want the best rockers for your car, T&D or Jessel. Both need to have head work done for the mounting bars. They hold over 900lbs of spring pressure at .800" lift. The
oil system in through the pushrods. I asked what spec you had to the motor. I have a set of your rockers here with the same breakage from DOVE. They make alot of rockers for other companies that have there names stamped on the rocker. You might want to have your
oil modes checked for enough flow of
oil to the heads. .060" is not enough and alot of guys are running this. The other problem is that with Ersons there has been a blueing problem on larger roller cam motors not spraying enough oil on the contact point of the adjuster and pushrod. I am not a PRO builder but have listened to the best builder on the FE forums and done tests myself to check on this problem. Your motor and MONEY. The next time you may loose a motor of 15-20grand over saving $300.00 dollars.
The bearings are caged in the Ersons so it's very hard for them to come free and damage a motor. T&D and Jessels have caged bearing but with there mounting system there bearing can come aprt and get into the motor. I know this for a fact. The solid plate rockers is a stronger design than 4 mounting supports with end stands. Your system is strong than the Stock system. Good luck. Rick L.