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When we first started diagnosing the belt issue we ran our Magnum race car on the dyno and shot video of the belt. If you use the link, you’ll see how violently the belt S-whips on the 1-2 and 2-3 shift. See “Belt issues on blown late model HEMI”
Of course, when you make a lot of power, it’s not just the belt under stress. The factory tensioner itself is a very lightweight and thin cast aluminum part with a plastic pulley. Between belt whip and tensioner flex, carnage can result. Let’s look at some of our own past experience with carnage.