While driving a Ryder truck on I-40 west of flagstaff in late summer
steadily climbing a very long grade, and doing about 65 mph.  Two white
Bay window style Westfalias passed me, obviously loaded and really
going, they must have been doing 80.  I was hoping they would pull over
so i could find out how they were doing and take a closer look, but i
never managed to catch them.  I assumed they must have had some kind of
engine other than the air cooled version of that era.  Since there are
inline engine alternative's for the water cooled vanagons, what engine
alternatives are available for that era westfalias ... if any ?  Or were
they possibly running really tricked out air cooled engines ?