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If you look at that dyno graph and see how much the power drops off after 6 why are all of you wanting to spin them so hard? Just for the sound or what. Making power past 6500 takes some serious parts. The spring pressure required to turn real high will twist a stock size came core if your not careful. There use to be some good articles on the old pro stock drag trucks that were limited to small blocks back in the day. Interesting reads if your into motors like me.