Wrist pin and bearing modification on 820's

[steve welte]

This is the modification that is done on the 820/610 for High RPM use. It requires grinding the needle bearing down in the rod eye and using hardened thrust washers next to the rod/bearing and then using spacers made of 7075 aluminum to set the clearance of side movement. Not easy to do. There are several people that do this. I do my own but Dave Bonbright and Terry Ives does this for customers.