Originally Posted By fast68plymouth
Originally Posted By BSB67


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"


And there is the answer. Thanks