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Joe Sherman Racing Engines' Super Flow 901 is on rollers and is portable. The control board isn't. His mufflers are Hooker turbos. They reduce noise, not power output. Sherman ran the 331-cid engine at 2,200 rpm for some 10 minutes in order to let everything reach operating temperature, to check for leaks, and to double-check the ignition timing. The engine's idle is lumpy at 900 rpm but not like a racecar. That's good.