Dart68,
I haven't had the luxury of tearing down any RB block main web failures yet...(I'm sure my day is coming) but I would think that many are a combination of 30+ year old cast iron, minute cracks and casting imperfections, major block flexing from harmonics and who knows what other contributing factors. Will a girdle make an engine last longer from a durability standpoint than one without? That's yet to be determined and probably dependent on HP levels, rpm, rotating assembly weights, car weight, and a bunch of other things. Will it allow you to sustain a higher HP for a longer period of time prior to failure? I firmly believe it will.
