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Those are pre-filters.They would keep ANY large pieces from getting into the oil pump and jamming the pump rotors that would break the drive shaft and also mess up the pump housing.These filters in conjunction with a NON bypass oil filter will keep ALL contamination out of the oil system in the event of a roller lifter failure or anything that causes contamination to wash down into the oil pan.Guess how much it cost me to figure that one out:eusa_boohoo: