James over at Fusion motorsports was very helpful to me about older NR pistons and sleeves. Has anyone found any good info (like sleeve dimensions)on the older engines? I know the hobby tends to sway people away from fixing old motors, and to just buy new (to spur consumerism?) but I like to use my old motors and my son is getting into the hobby as well. Far as I know, the #08513 P/S fits many of the early 35 engines (circa 99/00). If no one has found a good list of info on these older engines, I could tear some of mine down and take measurments.