I was talking to a buddy with a '71 Demon stocker last year and noticed he had the hood scoops sealed off. He said they picked up almost a tenth after closing them off.
From the factory the 71 Demon scoops were never open to the engine. They are just extra weight on the front of the car. The 72 with the sizzler scoop did have openings ducting air into the engine compartment but not sealed to the carb. On my Demon I never saw any difference with the scoop or not. I just liked the looks of the scoop.
A friends AAR runs quicker/faster with the hood not sealed to the carbs. The TA is a different story it runs better with the hood sealed.
