I did a complete rebuild on my 82 and finished about a year ago. I spent $675 for a complete set of Mahle pistons and rings. I'm sure it's quite a bit more now. The area that will most likely necessitate new pistons is oversize ring land widths on both compression grooves. If only the top groove is over, you could use a ring set made by Deves that has wider top rings to compensate. If the second groove is too big, I think you are out of luck. On the pus side, a properly rebuilt engine really runs great. And starts on the first glow at -2F without a block heater.
