MORE VALVE TRAIN QUESTIONS................

No heat required. I slid a 3/8" box wrench over the ball end of the rod - down to the back side of the cup, then tighten the ball end into a drill press chuck to hold it. Then tap the wrench with a small hammer and the cup will come off the the rod tube. You can use the drill press to reassemble the cup stem into the rod tube after trimming to size.