How the heck do you get that crudy varnashy crap of the valves.
tried soaking it in super hot water mixed with heavy duty machinery degreaser( I swear I heard one of the valves laugh at me)
Jose I had great luck with combustion chamber cleaner.It usually comes in an aerosal can.What I did was spray the whole can into a coffee can and soak the valves for a couple of hours.After that I was able to remove most the crud with a toothbrush (my wife's )This also worked well for my pistons.Be sure to inspect your valves very carefully once they are clean.Use a magnifying glass and pay particular attention to the exhaust valves.You're looking for hairline cracks which usually radiate in from the outside edge.Not uncommon.
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1986-GTV6
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER