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The initial combination on our hydraulic roller cam-equipped 496 featured a higher-end 850 carb that had been dyno-tuned in several prior sessions. The big-block delivered 417 hp to the wheels with an ideal-looking fuel curve. We were hoping to at least see the cost-effective Street HP (seen here) approach the baseline performance of our baseline carb. First up for testing was the smaller 850 unit. Out of the box, the carb was close.