[CRZN427]

Lots of things escape me lately, but I remember reading that Ford created the "Tunnel Port" manifold, which was a medium riser, that breathed better than the high riser.

The article said that it took the racing officials quite a while to catch on since the Fords using the tunnel port manifold were winning with apparently "stock" setups. The high riser would cause the hoods on the Ford racing cars to either be modified higher or have a scoop which was a dead give away that the engines were not stock.