if you really want to wake it up. add a hydraulic roller cam. the fast ramp will get the cylinders filling quickly. you want one with a split duration that is longer on the exhaust so the manifolds can empty the cylinders properly. i'm not the one to get to spec the cam, but look at the engine combo that was run by steve dulcich in the engine masters challenge. he did have headers so that's a big plus for him, but you have stealth heads so that's a big plus for you.

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