Rod bolts
 

I am thinking about buying a d16z6 from this guy. The crank bearing were replaced and the rod bearings may have also. my question is: is it necessary to resize the rods or replace the bolts?

Re:Rod bolts
 

Depends was there bottom end damage? or was he just replacing them if they were worn? You should always plastigauge the bottom end bearings when installing them to make sure the factory bearings are within specs.

You can reuse the old rod bolt/nuts. If you want to upgrade them, you could contact ARP

Jeff