To start at the beginning my 1.9 motor is apart to fix an oiling problem. It is pretty much still brand new. I have 9 to 1 pistons, dual sidedrafts, 290 435 cam and 2.0 valves. The head was completely done when it was built the first time too. Last week I got this wild idea that I wanted those high compression pistons that were on Ebay, the 2 Arias. I talked to Arias and they will make 2 more for around 250. The idea and question is this. Do I put these in this motor now while I have it apart? I'm not tied to this block or crank I could do another for the same cost, roughly 25 a hole. The Arias's are 12 to 1 I know I can feed them with the setup I have. This car will never be a daily driver, but can I power it on pump gas? Have I gone completely nuts and need the dinner jacket that goes with that? Or should I go for it, and what kind of bump in power? 7.6 to 1 was 78 horse 9 to 1 was 102 what would 12 to 1 be?