Just throwing an idea out there-
Is it possible that the electric fans cover so much radiator area that they restrict flow through the radiator at cruising speed? 55 mph should move a huge volume of air through a radiator- if not restricted. [No electric fan could free-wheel fast enough to keep up with 55 mph air]
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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