what does the anti-afterburn valve do and where is it located?

 

there are 2. one if them is part of the air control valve and it feeds air into the front rotor on deceleration. the other one feeds air to the rear rotor under deceleration, its bolted onto the carb. basically they are trying under decel to have the cat see a constant mixture/temp

mike

 

yeah but the whole jist of the emission control system picks on the back rotor, the nasty shutter valve and the afterburn #2 valve, but anyways, you were the only one that knew
LOL