But I think that the only difference is the ball and plunger cup size. I think plunger height and PR length are the same. I guess if you put a 68 PR in a 67 lifter the total stack height might be a little more.
66-67 = 9.375" 68-78 = 9.315"
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
