The etymology of "to gurn" is interesting.
fhg #22 "Ah: you have the Levine/Bayreuth set, I see!"
Actually, no: Solti, two Knappertsbusch's, Karajan and Gui. Who? Orch. and Chorus of the Radio Italiana, Rome, cond. Vittorio Gui. Recorded in Rome in 1950. Its a 3 CD set, the box proudly announces that it is "More than three hours", which is a devious way of saying it's cut. I bought it because it features - wait for it - Boris Christoff as Gurnemanz, Rolando Panerai as Amfortas and ... Maria Callas as Kundry. Its sung in an Italian translation. Not a first choice, but worth hearing, in my view, for Christoff, one of my favourite singers, and Callas. She abandoned Wagner early on, I think, in favour of Italian and French repertoire: Callas singing Brunnhilde would have been quite something.
If Levine's Parsifal is slower than Karajan, I think I'll give it a miss ...
My 3 CD set of Callas singing Parsifal under Gui (well, not literally, you understand) in 1950 is on the Virtuoso label. Code is 2699232, all three discs have the same code, but are simply labelled one to three. I bought it secondhand and have no idea if its still available. The discs are copyright 1989, Metromusica, Milan.