PROFORM VALVE COVER WING NUTS, CHROME, SET OF 4 -- 1/4-20 thread size; Nuts are supplied with a separate stud which permits precision gasket positioning on the head prior to mounting the valve covers; Ford Oval is cut sharply into the top of each wing nut; The lower ends of the shafts are manufactured with wide shoulders for broad load distribution; Does not fit FE engines; With 30-day Proform limited warranty.