Cast aluminum intake manifold for twin HS2 or H4 (not HS4) carbs. This intake manifold has been carefully produced to minimize cross-port flow interference caused by the balance tube and has generous radii in all the right places. Further blending can be done if required for port match, but leave a rough-ground finish to promote fuel atomization. Do NOT polish!
See C-AEG0489 for twin HS4-HS6 carbs.