Bobzilla I noticed the same thing after looking at the last picture a second time. That is just a standard GM flex plate and flex it did! I couldn't tell you how many of those I have replaced in just a factory street car or truck over the years. They are always cracked at the crankshaft flange. I wonder how many passes he got before it let loose?
Probably a low buck flex plate to boot, coming from somewhere on the far side of the Pacific. Amazing how guys spend kilo bucks on engines to make High Power, and yet they cheap out from the bell housing back.
