I rebuilt my Force 150 motor recently. In the process I bought some pistons for a different model year and have two extra. I am tired of keeping them around. They are new Wiseco pistons in the box never used. They fit many 50-150 Chrysler and Force models. If someone wants a good deal on these they are on ebay for the next few days. See item number 200123965850 or just look up Force Piston. They are the 3129PS ones.
