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The foot valve at the bottom of this production small-block Chevy roller lifter retains the tiny check ball and spring that functions to retain the oil in the area between this valve and the oil-filled chamber below. Noisy lifters can often be traced to crud preventing the check ball from sealing to the piston. Injecting carb cleaner into the foot-valve slots and following with compressed air might be enough to clean the check ball and restore lifter operation. Of course, we’re not guaranteeing anything, and this requires complete disassembly of each lifter.