Hi everyone, One of my camshafts has a groove on it. It is where the camshaft bearing cap goes on. I've posted pics of the groove, and can feel it with my finger nail. Is this ok to run or is it a ticking time bomb? Also one of the lobes has discoloration but is smooth to the touch, can anyone tell me what it is? Engine is a 6A12 MIVEC Mitsubishi, so probably a bit over 20 years old. Has had a full rebuild though.