I am not sure I follow your comment on the KB's versus 2.2 pistons. Those KB239's ARE for the 2.2L engine ..... ?????
KB Hyper Piston - Chry 2.2L Rod 5.945 Flat Top 5cc 2V [KB239] - $222.46 : United Engine & Machine Co. Incorporated, Performance Pistons
They are good quality hypereutectic pistons, are made for what you want, and the price is not unreasonable. What other 2.2L pistons are you considering?
