Why do I keep breaking rocker arms?

Slugfarm said
I finally have a couple photos and a little more info. So the mechanic is sure that this break is the result of over revving leading to valve float. I've certainly gone into the 5000s some and do tend to drive fairly aggressively. Mech wants to install a rev limiter, which feels sort of like training wheels, but maybe that's what I need. I did read an article about valve float that implied better springs would help guard against it. I'm pretty sure that the pistons, rods, springs, etc are all stock. Do I need to get high performance stuff to safely hit 5000-6000?

On another note, I finally had the chance to try out the distributor I got from @halifaxhops. It's incredible how much better the car drives. The man deserves a trophy or something.

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There is no chance of valve to piston contact in a 225 without serious compression mods and a LOT of valve lift, and floating the valves hard enough to drop-out a properly adjusted pushrod is nearly impossible, BULLSHIT..
1) Why is that rocker a dull gray color? Never ever saw a factory rocker that patina, dirty or clean, Evaporust treated? Were these things rusted to **** & heated with a torch to loosen them &/or the adjusters?
2) The pitting in the rocker tip is atrocious, was that rust pitting? Was it there before the "rebuild"?
3) You have yet to answer; *CAM/VALVES/SPRINGS*
4) I've redlined & neutral dropped the Slanty I ended up building when it was bone-stock in the car I pulled it from, drove it 2yrs. B4 pulling it to drop a 'teener in that car.
5) Those same rockers saw a ton of beating in the K6, including being held at 6K during burnouts, and saw 7K briefly a number of times. That's with oversize(read HEAVIER) 1.74"/1.41"valves, and 340HP single springs that were under-compressed on the exh. because I didn't have the shims to make-up for the longer AMC valves. If ever a valve were going to float & break a factory rocker, I'd have done it.
6) Finally, YES, Hoppy is a great Member & contributor to the Mopar hobby!!!