Just for the record, when Vanagons were first introduced folks were
quite impressed at the improvement they represented over the previous
models and some even went so far as to label them the "Porsche 911 of
vans."  This would explain a previous poster's impression that that's
the engine they came with or at least those trying to sell him one.
Of course when Vanagons were first introduced they were air cooled and
thoughts of Porsche engines, given the van's much improved handling,
were obvious.