i am going to be installing ARP's on my LS motor, just wondering if i can do this by just removing the oil pan and using the same rod bearing or if i gotta do any maching or get new rod bearings

 

rod bolts that is

 

you have to remove the rods, take them to a machine shop and have the rod bolts pressed in. They will then machine the big end of the rod to adjust for the distortion caused by pressing in the new bolts. I'm bringing some gsr rods to have this done in a couple days, costs me $50.