> Seems to me that there are two vents. One the same size as the fuel inlet The later (approx 73 onwards) carbs had two vents, but only one was supposed to operate at a time. The "idle" vent came out the side and was plumbed to the carbon canister/anti-runon valve. The "non-idle" vent came through the face of the carb, as on the earlier smog carbs. Randall