Yes hyd. lifters..don't know what the preload was, it had shims on the shafts along with lifters that were a little longer. Guessing shims were used for preload and to offset longer lifters to allow for clearance. Lifters were only put in to make sure engine was not further damaged. New lifters will be installed this weekend. The push rod went thru rocker arm and was wedged about 1.5-2 inches thru rocker arm.