Are girdles generally added for big rpm or HP or torque

rumblefish360 said
Crank main journals are 2.50 for everything except the 360 which is 2.81. All rods are 2.125.

Oh man! I don't know why I was thinking the 340 was BIGGER. I had it backward. So in my mind, I guess the 360 might be more prone to cap walk.

My guy thinks like MO above. He absolutely insisted on balancing my Scat "balanced" rotating assembly. I guess all good machinists think alike.