Have you read about this? [link:www.freep.com/money/autonews/knock14_20031114.htm|Problem with GM engines.]
http://members.tccoa.com/lastmrk/Images/lastmrk2.jpg
http://members.tccoa.com/lastmrk/Images/lastmrk2.jpg
I cannot understand with computer design and long term testing that a problem like that was not caught by GM before the new engine was released to the public. GM has been making piston engines for one hundred years without that that problem. It is unbelievable that a design flaw like that can occur.