Are girdles generally added for big rpm or HP or torque

I have to ask, in the past, you have noticed cap walk in past engines?

In the current engine that makes use of the girdle, what kind of useage did it see and for how long?
Thanks Mike.
Had a 414 stroker that I ran a couple years, it made 515Hp, when I took it to the machinist he showed me the signs. Number 2 and 4. Pretty bad so he said. It ended up being a "shot" block in the end, so we didn't have to address the issue.

Current engine ran last year 2100 miles. It never leaves the garage without a couple passes. Pretty hard use. Had to tear it apart to ease my own mind, but the maincaps look new as well as the block mating surfaces. This is a 4 speed car with 430 gears and pretty sticky tires. No walk at all.

I don't consider wasting money on anything in my motor that MIGHT help. It can't hurt.