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Crank modifications for increased power Part 1

In this, Episode 23, part 1, DV looks into crank prep moves that can help increase the high end output of your motor. Some can be done at home to boot. Also he looks into design features that you need to know about if you are buying a crank - especially if it is a low buck stroker crank. And, last on the list, is the fabled 20 hp increase supposedly delivered by micro crank polishing. So does it - or is that just ad hype?