Personally I think full roller rockers are overkill. 98% of the friction is in the rocker tips to valve stem.
I ran mine consistantly to 7,000 rpm with no issues and fit under the Cobra covers with no issues.
Now if you want to talk about uneccessary overkill and issues up the kazoo, ask me about my shaft roller rockers.
Oye vey! What a pain...but they're good to 9,000+! I'm not though.
Doug , the "majority" of the friction is on the trunion. ( focal point) The ONLY benefit of a roller tip (only) rocker is less guide wear. I frequently see the "cup" portion of the roller tip rockers with blue discoloration from HEAT. Comp says this is because of the material ( a variety of stainless) and it "shows heat" more than conventional cast iron and is nothing to worry about. RIGHT
Yes shaft rockers are WAY overkill on a non dedicated "race" engine.
The ball fulcrum IS a type of ball bearing. That is not where the wear patterns show up.
Run long enough the valve stems will wear into the cast rocker arm besides wearing the guides in an oblong pattern.
The shaft rockers are a regular PITA to set up right. Right off, they bent four push rods. They have to be zero on in three axis compared to only two for stud mounts.
Whats wrong with overkill? What's wrong with two 725 carbs on 347?
That's why I'm know as DD. Dirty Doug. If you're gonna' hang, hang way up there, not just so your toes can't reach the ground?