My understanding is that you can get a little better than 1hp per cu in with upgraded airflow-- I'm not expecting much more than 500 out of my 461, for instance and that'll have new everything.
What if you did three NO2 cheater-plates and sprayed it? Maybe with a dedicated fuel cell that has race gas in it? Or three supercharger hats and do a tripower procharger setup? Amazing.
If you want to make much more than 400hp, you have to figure out what you want to change, right? Is your goal to keep it stock-looking or acutal stock? How fast do you want to spend?
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