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So the two choices that seem to be available are either the steel or titanium, it seems like all the engine books I've been reading (granted these are usually v-8 biased) seem to say that while titanium retainers do help, they only reccomend them for track only cars, where you will be regularly pulling off the valvecovers because their reasoning is that the titanium retainers are more prone to cracking and subsequently coming apart than their steel counterparts. They say on a street engine just to run steel becuase the chance for cracking is lessened and since you don't pull your valve covers that often, its one less thing to worry about. Is there any truth behind this?