This used to be a common hop up trick on engines with siamesed intake ports.
Funny story. Colin Chapman started out racing a home made sports car in a class for Ford 4 cylinder flathead engines. The port divider was a common hop up trick. Then the racing rules committee banned block modifications including the port dividers. So Colin welded the dividers onto his intake manifold. Presto, the same result with no block modifications!@ ha ha ha.
All you need to do is make a divider of sheet steel and weld it into the port. Then make an intake manifold with separate ports.
