Soak them in the oil you are going to use in your motor. Stand up the lifters in a bucket or what ever . Submerge the lifters in oil. Make shure the lifters are standing up when you do this. Now get a pushrod and push down the plunger. you will see air bubbles come out of the oil hole in the lifter.Repeat this untill there are no more bubbles. Your lifters are now preloaded. (The oil level in the container you are useing need to be higher than the lifter when the lifter is standing up.)