I agree Mark but I think the Harland Sharps, Scorpions, etc are built the same way. I do believe if you use too much valve spring and try for too much RPM you better get the T&D or Jesel. Stock rockers lasted in my 440 Mopars and SBC Stockers at 7200 for years.
I also think the stud girdle is a critical factor for keeping stud rockers "in their place".
Hope you all have a great 2024.
See ya at the stripe!

Jok