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What's the purpose of that open area...by the way, imo the FelPro look like *&^*(. And when you use the stupid plastic cup rings it holds the intake up so it doesn't set on the heads???

The horseshoe shaped passages are air damns to break up the heat collection from the 2 inner exhaust valves and the heat cross over all being united with out some sort of break up between them would create a very hot spot in the center of the heads. They actually do not go into anything and have no gasket coverage they remain wide open.