Aluminum vs Cast Iron bell housings

Ya it's not a problem until it is. A few years later I had another like failure, but with all the SEMA stuff, as my racing effort was more "serious." This time everything was contained, so I can definitely say the shield works.

I think I still have box with bits of some of my blow up parts, clutch and engine pieces; I used to spin them pretty high and once in a while some failed. That said, I run a stock BH on my '70 and have no concerns, though it's strictly a street car and I would never put slicks on it, rev it above 6,500, and drop the clutch like when I was racing years ago. So I guess it all depends on how you are going to use your car, but to the point, my experience, is that neither stock BH is significantly safer if there is a failure.