i am in the process of putting a cam in my 88 fox i bought a set of comp dual valve springs that match the cam but ive called two machine shops ant there tellin me they may have to grind the head for clearance at the valve seal anyone herd of this they are stock e7 heads and the cam is only 512 lift. My plan was to lap the valves and throw the springs in myself I just dont see investing much money in a stock set of heads. thanks