can any one tell me if this is something i should be worried about.the whole inside of the bell housing looks like it got a bunch of cracks.
Flyer, you are completely correct.just as a precautionary note... don't think about polishing the rod beams yourself. if done incorrectly the rod can be weakened, also after deburring/polishing the rods would require balancing/rebalancing...
casting flaws, as noted, can be the starting point of a crack... in ultra hi perf applications it would be wise to polish them out... but for most applications you'll be fine leaving the housing as-is. most folks in ultra hi perf applications would remove the bell from the case and use an "Ultra Bell" such as one of these...