Brian. It's common for engines move a little on the dyno. Even street engines move that much. My engine on the 2886 hp pull rose about 2" due to the exhaust pressure and slammed back down when pulling out of the throttle. Also pushed the dyno forward a couple inches. It's on rollers. It's also common to get a spike at the end of the pull when the dyno pulls the engine back down from the preset rpm limit. Torgue link see's more pressure.
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