I pulled the motor in this truck I bought to clean it up and install new gaskets. Turns out it had a bad intake manifold gasket and had been dumping water down the heads and into the pan. There was a nice inch or so of sludge in the bottom of the oil pan. After looking at it I noticed the #1 and 2 connecting rods were discolored. They look like polished copper down at the crank end. WTF is up with that? The motor ran before I tore it down but smoked a little bit. No knocking or strange noises. It read 40 psi oil pressure and actually ran pretty good.. Does anyone know why the rods would do this and are they still good?