A friend of mine had a 1967 GTO with a small block Chevy with dual quads on a Wieand Cross Ram intake manifold which made a noise as described. One of the carb mounting nuts were loose and the carb gasket was making a noise almost like a kazoo at a certain range of RPMs. Maybe an intake leak or gasket vibration somewhere?
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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