Everyone one of these valves is mushroomed around the top keeper notchTypically shims on new springs are to get the installed height correct. On older springs they can be used to get more closed pressure but then you have to worry about coil bind. You have to have something between the spring and an aluminum head to keep the spring from digging into the head.
How thick it is could be that’s just what the factory used or someone shimmed them up for some added closed pressure.
Ok. So the thought is new valves?Typically the mushrooming is from floating the valves and the valve tips not being hardened. Once they do this they will continue to do this so its time for new valves. To get them out you can grind the mushroom part down and slide them out. Don't get hung up on high dollar valves for these heads but you should consider SS for the exhaust side.
After looking at the pictures of those valves I would not use them. That is just me as i am cautious after loosing a motor to a dropped valve. Maybe call this guy and see if he has some good replacement valves as they seem very fair on the price.
If they are in that bad a shape you will have to use some courser grit..... 400 maybe?? I am suggesting a lighter grit so you do not do anymore damage to your guides....It’s eating through this 1000 grit
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