Bob I agree with Brent, but i would add that it does reduce friction (dissimilar metals) and it gives u an opportunity to verify and correct bore alignment. I went with a .903 vs .875 lifter so adding bushings was not a problem.
The SHP or sportsman block does not have rear
oil feed, so
oil travels from the front to back, therefore; the rear lifters are fed first. By tapping in from the rear and plumbing to the front a more balanced stream of
oil is provided to the forward lifters. I am sure Jim could add to this.
MP