I started by thinking one or two Flathead intakes would look good "wall hangers". Now there are 140 here, with no sign of letting up. Many manufacturers are represented, each with a speed secret: in the second row, there's one of Barney Navarro's curious "dog bone" dual intakes; alongside it is the same manifold without the water-heated riser. Nicknamed, "The Professor," Navarro clearly understood the physics and chemistry principles that separated inefficient manifolds from the ones that set lakes records. H&H Flatheads manufactures nearly all of Navarro's manifolds today.