Started out to replace the starter contacts today and after the usual difficulties, got the intake manifold off, disconnected the started and found it absolutely froze solid to the block. Took a few good snacks with a rubber mallet to break it loose. The pictures below are what I found. It looks like the starter body was firmly corroded to the engine block and broke when I knocked it loose. Anyone seen this before? I'm assuming a whole new starter is in order...?