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Reply to "New Heavy Duty 351C Block, by Tod Buttermore"

If you run a roller hydraulic lifter on a cam with lots of lift, the higher bushing contains the oil in the lifter. Otherwise, the standard cleveland bore may not be tall enough, depending on the bleed hole positioning in the lifter body as well, and permit the oil to escape from the lifter body while it approaches the cam lobe's peak lift.
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