Piston Question

get yourself a $8 HF digital scale that goes to 1000g. Weigh the old and new with pin. you can take out weight from the pin if needed, just grind a little out of the ends. Many pistons are both floater and pressed, just having a clip boss machined in them for floaters. The pin is held to the rod via an interference fit, the piston floats on either pin. Its the rod that is different. You could get away with 1 pressed and the rest floating but they will have to weigh the same (piston pack, total rod, then little end and big end)