Super Chevy magazine has an article where they dyno'd a 383 on both an engine dyno and then on a chassis dyno. On the engine dyno it made 425.8hp and 473tq with open headers an no accessories. On the chassis dyno it put down 283hp and 341tq through a M-22 trans. That's a loss of 34% do to things like the accessories, fan clutch, exhaust, etc.
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