m35a2cowner

DR is right penetrating oil will work its magic over time. Many moons ago we use to use something called Berryman's Chemtool to clean the varnish off of parts and valves and guides. I don't know if they are still in business. If for some reason the penetrating oil does not do the job you also try grabbing the spring retainer and move it back and forth while spraying more oil. I am guessing this is a flat head engine, you might also try very gently prying down on the retainer with one of those curved pry bars. Don't pry to hard you run the risk of bending the valve. If this is an overhead valve engine there are a couple of other things you might be able to do.