From Summit one can buy the proper Federal pistons and rings for the 4.1 motor. They are less then $200 (for both pistons and rings!) and they are in stock. Yes they are Hypers and yes that is cheap. Scottie has gone 10.30's so far (3.8 Hypers) and I have gone 11.15 with the 4.1 version. Until I prove myself wrong I will keep building 4.1's and I will be using the hyper pistons... headbangThe price of pistons has been the biggest deterent to running a 4.1 V6.
Here is the project. We have a 4.1 to build. It will be a carb (Q-Jet) turbo from an '83 3.8. We have exhaust manifolds from '85 turbo and will fabracate the up pipe to the turbo.