Scroll down here and read Tech Tip -2005, written by Iskenderian....
http://www.iskycams.com/techtips.php

Compare the wrist pin placement to the oil ring in this 5.7 rod piston....
http://kb-silvolite.com/performance....tails&P_id=212

With this piston using a 6.0 rod....
http://kb-silvolite.com/performance....tails&P_id=101

A spacer ring or other apparatus must be used to support the ends of the rails and expander as they rotate in the ring land. More stuff to go wrong in my opinion.