Keep looking. SAE isn’t the only place to look. A see if it were, 1993 is an ice age ago in terms of exalted advances in springs and such. And yet and still, much like BH springs they just don’t offer enough of an advantage to bother with. I realize you are invested in the BH being the end all for every ill of the pushrod engine, but real world results don’t match your wet dreams. Get over it.
