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15 Stock cranks, like the ones we are using, are notorious for often being slightly undersized. Plus, the extra polishing work we did on this one probably also contributed to the fact that we were getting too much clearance on both the main and rod journals. To bring the bearing clearances back into spec, we ordered up a set of X bearings from King. These bearings are thicker to take away 0.001-inch of clearance. For the main bearings we only needed to tighten up the clearance by 0.0005, so we used a standard shell in the housing bore and an X shell in the caps. The rods were running 0.003 total clearance, so we used both X shells to get an average 0.002 bearing clearance all the way across. View Related Article
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