If it is a rod making noise, the noise will go away or be reduces as the engine is under load and will be the loudest as the engine is freewheeling. In racing, most rods let go as the driver takes their foot off the gas pedal. When applying power, all the play in the rod is held tight but when the gas pedal is released that play loosens up, the noise gets loud and the rod comes apart. You should also see a drop in oil pressure when the engine is at idle.
If it is making noise, it is to late when it comes to a bad connection rod. The crankshaft journal will be worn egg shape and the new bearing insert will not fix that. The crankshaft will have to be ground and a under size bearing installed. Is the noise louder when the engine is cold or hot? Does the noise get louder as the engine is revving up or as it is revving down?
The bottom ends of these engines are pretty bullet proof. They don't wear out unless it has been over revved, not changing the oil, or ran out of oil. To blow one one these up on the lower end of the motor, you have to work at it. I am not saying it is impossible. There is not an engine made that can not be blown up. It is just that these motors don't make enough power to readily come apart at the lower end.