Special fabricated inlet manifold for twin H4, HS4 or HIF4/38 carbs. Bore is 1.5" at the carb flange. This manifold gives a useful performance increase over the cast aluminum manifolds. A quality Maniflow product, made in U.K.
If you intend to run twin 1.75" carbs, this manifold will accept them, but a larger bore manifold is recommended for this conversion.
Note the manifold has no fitting for the throttle cable, so that must be fabricated by the customer, depending on type of carbs to be fitted.