The connecting rod hone is a fixed stone, eccentric style hone. You grind the cap and rod at the parting line to give you material to remove. The honing head runs pretty slow and it is a hand process. The secret to getting perfectly round and taper free big ends lies in the process. You hone the rods in pairs. This covers more of the stone. You move the rods over the stones with a prescribed stroke speed and pressure, say 5 strokes to start. Then you swap the front and rear rod position and do 5 more strokes. Then you flip the rods over and do 5 more strokes. Then you switch inside and outside for the final 5 strokes. That completes 1 cycle. Then measure. As you get close to zero, the number of strokes decreases, possibly down to 1. This gets every part of the rod on every part of the stone. Once you get the hang of it, the rods can be made near perfect. 0.0000 +- .0001" is not that difficult. You want 60% or more of the rod right on spec. The parting line +- 10% on each side will be large on purpose. This is to prevent pinching and spinning a bearing under extreme load. Each reconditioning procedure does make the rods effectively shorter. So that needs to be addressed with your deck height and so forth for a race build. Hope this makes sense.
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