I'd like to think that the crease in the flex blades of that fan create stress risers, causing cracks to start after enough flexing. The reason I'd like that: because then I'd be more comfortable with the curved blades on the flex fan I just put on the Pontiac in my GMC!
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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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