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interesting reading on the 428 forum. I noticed under the "water pump pulley notes" that our own Brian Conway found between the two sheaves C6TE-8509-C. That pulley, from the mustangtek website, is for a 68 289, 302 Fairlane and Falcon and also 69-70 390 Ford. I'm assuming that 2 pulleys were grafted together to form the C8OE-8509-A ??
The water pump pulley is a 3 groove pulley with a C8AE-8509-C before 9/1/69. And a C8OE-8509-A after 9/1/69 with an outer diameter of 7 7/64" on both and an inner diameter of 6 17/64" on both.