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All I am saying is that I would not be comfortable with 440s for 9 psi or higher on a JRSC with stock internals. You have to run really rich to keep it "safe" for the stock pistons (11:1), so I would rather have 550s to ensure I can deliver that. Personally, I would not run higher than 9 psi with a blower. If I wanted to run higher than that, I would get a turbo and enjoy the benefits of an intercooler.
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