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6a. Do: If running a solid-lifter cam and not running restricted lifters (not all cam companies have them), you’ll likely install lifter-bore restrictors. When tapping a lifter bore (1⁄4x28 tap) for the restrictor, unlike the cylinder-head bolt holes, in this case it’s crucial not to tap all the way to the bottom. You must leave a floor at the bottom for the set-screw to butt against so it stays tight.