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There Not stronger, there lighter and they absorb alot of the "shock" that's why you see them mostly in nitrous engines, they help save the crank and the block from a beating, but there is no way to tell if there ready to "go" I've called rod companys about this they said an old rod might last as long or longer then a new one that's part of the reason they change them so often, and if it's cold you better heat it up real good before beating on it