Guess I should ad changing two that pin the same will do little to change the curve. Yes some do have different taper that Holley claims this changes the amount of fuel it flows but it will do little to change the amount of fuel there. Funny how no one else does this, so makes one question how much this taper changes anything. I hear the no use pinning thing all the time, I have pinned every Holley jet from 62-110 and can tell you the only time I have seen the same pin size is in SOME sequentially numbered jets, Most likely why many suggest never bothering to change just one sizes at a time, always go up 2.