The rods in my engine no longer have the code 3 or 4 on them. I have some new, "prepped rods" that I want to use, but they do not have codes on them either. The codes on the crank for the rod journals are all 2's
The rod bores for the rods I took out of the engine each have a bore size of 1.615" (without bearings) and they have the "black" bearings which makes them #4 rods. However, they are not round and are 1.616" at their largest point.
The bores of the new rods all measure 1.6145" and are round.
I'm thinking that the used rods could very well have opened up a half thou, but since the bearings are not cheap, I don't want to order the wrong bearings. And spec clearances only give me a half thousandth margin.
So here is my question. Does anyone know what the bore diameter of a #3 rod and a #4 rod should be?