Are girdles generally added for big rpm or HP or torque

gzig5 said

What does a "mild" 575 hp small block combo look like?

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I was wondering the same thing. I've been involved in dirt racing my whole life and the last time I even heard of a production block Chrysler running was in the 80's. And yes, I never saw a LA block break. I attribute that to the fact that something valvetrain related always parked them first. And the ones I saw were in the lower stock and sportsman divisions (about 400hp back then).

A few guys ran W2/R/X engines in the 358 modified division in the 80's. They ran well, but the guys running them never did so for long. Too expensive, and problems getting parts. In later years some guys ran the R/A/W/5/7/9ect ect. Those engines were very competitive, cost a fortune, very difficult to get parts for, and were not even remotely Mopar.