hello im replacing my manifold on an OMC 5.7. here are a few photos of the riser. im wondering if the riser needs replacement aswell. where i question it is it seem like little rust balls down the center where i thought only exhaust should be. saw no rust in manfiold where exhaust flows. its it from being close to the water that that that little rust is forming or is water leaking back into it? or is it safe and reusable?
