91-03 or 04-up heads on an '89 xlh?

[jonkraushaar]

When you have head work done some people change cams and the 7mm valves cant handle the pressure of the new cam it may have way to much TDC lift for those valves to handle so you convert the head to 5/16 valve stems, bigger springs, stronger retainers and heat treated valve locks . This way they can handle the pressure of the new cam and you dont have to worry about popping the heads off the valves because of the higher lift cam.