I'm gonna refresh my engine installing a new piston/sleeve set, and obviously i'm also installing new bearings and rod.

Question is: should i breakin the new P/S with old bearings and old rod???

Some mates told me to change P/S first, and breakin them with old bearings and old rod, with the purpose of not giving too much stress to the new ones.

This seems to me the right thing to do, but i'm also wondering if old bearings and old rod, with no more perfect tolerances (play), could affect negatively how new piston and sleeve adjust to each other..

What do you think and/or usually do?

Thx 4 advises