The E303 is a steel cam. If you have an aftermarket cam from Summit that mimicks the E303, it may be cast, I don't know. I do know that Ford roller cams are all steel, and their flat cams are cast. As far as yours failing, it's not likely to just break. The odds are better that it will slowly wear away the cast gear until it just strips it. This could take 50k miles, if your grandmother drove it. Thing is, while it wears away, the shavings get into the oil, and metal shavings in the oil is just not a happy thing. If you wait until the gear "breaks", or fails, you may have already done plenty of damage with the shavings.
I'll go look through my Ford catalog, and if I can find a place where they confirm this, I'll scan it and post it for you. I don't want you to be unsure of who to believe. I've helped you before, but I'm sure the guys at Summit have too. I'll prove my point. I want to earn trust.
Take care,
-Chris
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