This is how I install roller lifters on a small block ford 302 5.0L roller engine. I begin by using Ford Racing's performance roller lifters. Once I take them out of the box, I give them an oil bath for about 1 full week. This allows the lifters to fill with oil and all the air to escape from them. Next, I start with a clean work space and begin dropping them in one by one. This is a little messy process but in the end, the results are great. I also clean the dog bones and spider with degreaser and re-oil prior to installation.