A rod bearings main purpose of existance is to trap particles and prevent damage to the rod journal. That being said, these bearings have lived their life harshly and it's evident on the crank's rod journals. Unfortunately, just inspecting the crank's main journals involves all new TTY bolts for the block, so regardless, might as well spend the extra $50 and replace the bearings. Judging by the rod journals, I would care to put money on the mains being scored as well. As for regrinding the crank ... if you can feel it with your fingernail, time to machine off .25mm and move up to the next sized bearing ... but that's just my opinion. Remember, you can only do it right once
