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The heads are essentially identical except the BD has a symmetric valve placement (exhaust-intake, exhaust-intake, exhaust-intake, exhaust-intake,) as opposed to the conventional Chevy style alternating valves (exhaust-intake, intake-exhaust, exhaust-intake, intake-exhaust). Horsepower in each should be very similar if they have been given the same port machining. You mentioned the header is different, remember that the injector is different also.
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