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Demon Carburetion supplied us with a 650 (shown) and a 750 Speed Demon to try on the 302. But, lo and behold, the 575 proved to be the strongest of the bunch. "We rate our carburetors based on average airflow or cfm," says Doug Schriefer of BG. "So the cfm number is not an end-all, be-all number, as most people think." In other words, the Demon 575 might flow like a 650-or-larger carb from another manufacturer.