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Approx 8 years ago I replaced my stock 98 GT engine with a 4.6 stroker. Nothing special other than adding Ford Racing intake manifold, Ford Racing PI heads, and cam. Additions are 40 lb injectors, and a Vortech v2 Supercharger with a T-rex fuel pump and removed all cats and replaced with Ford Racing shorty headers and Flowmaster exhaust system. My problem is that since day one dyno testing only produced a max of 356 HP. Engine runs great otherwise with less than 7K miles. Any ideas as to why the HP is so low? Shouldn't it be higher?
 

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I also have a stroker but with tfs 38cc heads and an edlebrock intake im making 360 hp n/a and a little over 500 hp on the spray

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