I want to use one of these an internal balanced 400 SBC build. They are 15 lbs., made of "nodular" iron and were spec'd by chevy as their "Hi Perf" flywheel. I know many people have used them over the years in all kinds of applications. My only concern.., has anyone had one come apart. This engine will make 550+ and probably never go north of 7000 rpm and we will be using a scatter shield. Any comments are appreciated. Thanks, Ric.