I recall someone made an overhead valve conversion for the 9N, 2N, 8N engine. These engines were modified and used to power midget racers at one time. The Museum of American Speed has at least one other 9N, 2N or 8N conversion in their collection. Does anyone remember who made the original conversions and has any information on the conversion kit? Obviously it was an aftermarket company -FoMoCo never made one.