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If you are required to race flat-tappet lifters, always try to use the largest lifters available. This requires honing the lifter bores, but it is often worth it. As you can see from this diagram, the smaller lifter (light gray) is limited to the rate of lift in the lobe before the edge starts digging into the camshaft. The larger lifter can be used with a much more aggressive lobe. Courtesy of Comp Cams View Related Article
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