Brought it to dealer (that I purchased from) Thursday morning. A few hours later, got the call, "It's a bad head. Common thing. We have it in stock (!!!). Do you want us to do it now or schedule for another day?" "Uh, yeah, do it."
Got it back Friday night. Running smooth. They did a nice job. Engine compartment looks clean. They changed the coolant too.
Maybe the fact that I bribed them with Dunkin Donuts when I dropped it off helped?