Cast alloy type, Fits either twin
HS4 or HS6.(requires modifacation to fit HS6.2 extra studs per carb)
This intake manifold for twin SUs 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, but leave a ground finish to promote fuel atomization. Do NOT polish!