Quote:
Originally Posted by 19652plus2
I think "pitch" is measured in the following way. As the fan is lying on a flat surface, you measure up from the surface to the highest point of the blade.
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This isn't a way to measure but....... My 1972 Pontiac Service Manual has a chart for all '72 models. It shows which fan they should have with the number of blades and the pitch listed. So if you have a manual look it up. On my car it is as easy as counting the blades then looking at the chart to get the pitch then buying the clutch for that pitch............