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Probably depends on how much high rpm/beating etc they see. I'd guess most duals with a TR 224 should go at least 25,000 miles or two years. Thunder might also have an idea.
thanks brah.getting ready to install the stage 2 5.3 heads from terry but not sure yet whether go with the tr224 or sometin a little aggresive.not a daily driver.
thanks black z.was looking at that tr230.dont feel like changing springs yearly.now 40-50k mi. with the tr224 I can deal with that.have it on hand with 112lsa.still not decided.still looking around and searching for a N2Ocam.