So after rebuilding my sled after 3 years of it breaking (see my long list of threads on here if you want a good story) I found out that I may need new pistons. In a previous post I mentioned I did a compression test which came back 30, 30, 120, 30. Then used a bore scope to check if the valves where seating correctly, thus the thought of a broken ring. This is a new animal to me that i'm comfortable attacking even though I do have quite a bit of questions. What is normal compression ratio and compression for naturally aspirated sleds vs boosted sleds? My best cylinder was at 120psi What brand pistons are trustworthy out there for turbo applications? So far i've found JE and Wiseco brands What compression ratio to use (normally running pump gas which is 91-93 in my area with the ability to dump in some race gas or E85 if I want to have fun)? How far should I if at all bore out the cylinders for the new pistons? According to the Wiesco site they offer a 74-76 bore size with different compression ratios Will I need a retune If I bore out the cylinders? I currently have a pure logic controller and would have to learn how to reprogram it. Any questions for me please do ask.