I was toying with the idea of running the JUN high comp pistons with my stillen supercharger build, I believe they are 12.3:1
although if you are wanting around 400rwhp or so, why not just go a VK56/LSx, either of those with basic breather mods will run that HP all day long as it'll almost be a standard setup, this is if you are going down the route of running a different ECU etc..
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