And that was my plan all along it's right on the edge 10.5 and 10.7 with 93 octane.other option or these pistons DODGE Speed Pro H116CP 30 Speed-Pro Hypereutectic Pistons | Summit Racing. I do appreciate all jumping in on this why I made the thread it's a great learning experience what I thought I knew. What I now understand more so. I'm in good shape for what I wanted is my conclusion.