In 1968, the Mustang 289 and 302 engines were the only two engines to receive a flex fan. In order to get the flex fan, the cars had to be eqquipped with air conditioning. The number stamped on the fan is C8SE-B. The fan had 5 blades, was 17.5 inches in diameter, was 2.5 inches high when unflexed and used a water pump pulley ratio of 1.13:1.
Engine RPM required to
pump at 2000 RPM
FAN TEST SPEED @ 200 WATER PUMP RPM
Diagrams & Drawings
Typical Front wheel assembly for Mustangs between 1965 and 1973. 6 cylinder is shown V8 is similar.