Head Work

I use Ford "300" valves in a lot of my heads. They are 1.78/1.50 and are the largest valves you can put in. However they are not a drop in as the guide Diameter is different. The problem is deshrouding the valves with the larger ones. Also you MUST have at least .060 over bore or you have to notch the cylinder. I like .085 or .105 over on a slant engine.
Grinder I got your back buddy.
Frank