Pontiac Lifter Guide - Lifter Lowdown
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A machined groove in the lifter's internal plunger allows pressurized oil to pass between the lifter body and plunger at a high rate at low engine speeds. It results in less valve lift and duration, which improves idle and low-speed performance. The effects are not as great at high rpm, however, and the lifter begins operating conventionally by 3,500 rpm. View Related Article
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