Unless the intake manifold and port for the car that has the potential booster problem ( 59? ) are radically different from 95 + percent of the other Chrysler products, the vacuum for the booster is ported from the intake manifold and is common to the entire intake. Ill grant that the port is probably closer to number 8 , or is perhaps between numbers 7 and 8 depending on the intake style, but the booster takes advantage of the entire volume of vacuum available. I highly doubt that the design of the intake manifold directs vacuum from only one cylinder in a V-8 engine. Mikey 62 Crown Coupe