I don't know of any crank girdle that reinforced the main webbing It is the main webbing between the bottom of the cylinder walls and the main bearing bores that fails on the RB,440, blocks, not the oil pan rails or main webbing ribs from the oil pan rails The girdles can't fix that, new better race block do that well
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)