These tappets work with all 1989-2018 Dodge Cummins engines. At 1.45″ they will not have interference with the Fuel pump eccentric on 12v engines and are much wider than the 1.1″ tappets used in early 12v engines. This means they have more surface area to work with our wider lobes which will promote much better lobe life with todays low zinc oils.
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