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Also, to add, the angle of the valve to head makes it so only the very top of the valve may make contact. That means only a slight crescent shape area need be ground to accommodate the interferance.

I have great respect for GOSFAST, but we are not talking extreme tolerances here. Much of which becomes bragging rights. Way to much money can be spent on bragging rights issues. Remember how basic Ford approached things and how well they work.

Only you know how low or high one seat may be relative to another. We need more info regarding that to make a recommendation. A good photo would help.