But don't know if they are for small block or not... or if they are good. I also read they dont make them anymore so if any break you are kind of **** outta luck and have to mismatch rockers.
If properly installed, you don't need to worry about breaking.
But those look like bb rockers. Notice the offeset of the adjuster? Sb rockers don't have the offset. Typically there are springs on bb rockers, but he may have swapped solid spacers at some point.
Wouldn't hurt to reach out with a question to confirm though?