The dual port head came stock on the US version of early Road Rockets with a bolt-on two-into-one manifold and was later modified by BSA and sold as a racing accessory permitting installation of twin carburetors. Casting number 67-1106 is written on this head. The twin carb head originally came with alloy manifolds (right 67-1330, left 67-1331) but my head had custom made iron manifolds. Please write me at firstname.lastname@example.org for FURTHER details.
Below is the early RR head with bolt on two into one manifold (got the image from ebay where this head was on sale)...
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