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25 The last of the carburetors that Panhandle bolted up to the 331 was a larger 950-cfm four-barrel from Pro Systems. While the Pro Systems carb had the same venturi size as the Holley, the throttle butterflies are larger (1.750-inch versus 1.690-inch). This can affect low-speed throttle response and power, but increase power at the top. The 950 dyno pull netted 514.1 hp at 7,200 rpm and 430.2 lb-ft of torque at 5,300 rpm.