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Roller cams must be bushed very carefully to keep them from "walking" forward and back excessively in the block. They move around because roller lifters don't rotate around their centerline like flat-tappet lifters, which hold the cam in place. For roller-cammed engines, Urban spends considerable time choosing and machining a cam button, like these shown, to hold the cam between .012- and .020-inch clearance. View Related Article
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