Are girdles generally added for big rpm or HP or torque

Ya know Rumble, I think the jury is still out......

Maybe my caps would look good if I didn't have the girdle, I don't really absolutely KNOW if they work.

I know my macinist/dyno guy told me, at least in my case, with my block, it was money well spent. I consider him a Jedi Knight of engines. He seems to always end up right in the end. Maybe someone will do some real testing someday....

My personal feeling is you're going for 500 and above, the price of a girdle is nothing compared to what you're gonna spend. Why not throw it on there. Like I said before it can't hurt.