Inliners International Forums General Discussion Hi Performance Best 4bbl manifolds for inline sixes?

The manifold referenced is not the Offenhauser Port-O-Sonic (similar to the Edelbrock Torquer etc. single-plane), but the Offenhauser "Dual-Port" (runners are separated upper and lower).
It was produced for the Ford 240 & 300 BB6, AMC 232 & 258 L6, and the Toyota Land Cruiser L6, and many common L4, V6 & V8, but no other L6 engines.