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The Holley carburetor provided a good deal of adjustability, since all of the air bleeds and metering block orifice holes are threaded. It also boasted a four-corner idle circuit, which would not be of benefit on the dyno but an asset with the engine in a car. The BSFC numbers are used to help shape the fuel curve. Changes to the air bleed size will move the slope, while jet changes tend to move the entire fuel delivery up or down. The Holley’s as-delivered high-speed air bleed size is 0.034. We tried 0.036 and 0.038 with no improvement. We did not alter the low speed bleeds.