Also hitting up this old thread lest somebody might have updates on this topic. Can anyone using the later pistons (bigger bowl) with their pre-1992 injectors and pump follow up on longer-term outcomes of making the switch (with the later, thicker injector seats). I need to make the choice. I have been told that while bowl depth is shallower, there is still a slightly bigger volume in the larger bowl? Can anyone confirm this? Some say good to go, others not conclusive, or replace with the original bowl size. Cheers