[cab]

he means the gasket under the top part of the carb,i test for leaks with some carb cleaner .I had an idle that would go high and then drop ,checked with some cleaner spray the bottom of carbs and then around the manifold with the motor running found the leaks ,redid the intake and now no leaks.bump up the timing a deg or to and balance the carbs.got my webers from red line called ingeles and got a jet kit made 1 change to the idle jet..