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We have a very limited quantity of brand new (NOS) 1993 Cobra waterpump pulleys!!! These are genuine F3ZZ-8509-A pulleys that are impossible to find new or used!!! Order on-line or call ASAP as a sell-out is assured!!! :)



 

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How much are they fetching these days?
 

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Is it an underdrive or overdrive pulley? I would think the one listed here and the ASP part are the same size, but one says it overdrives and one says it underdrives

- Cobra water pump pulley, genuine F3ZZ-8509-A over-drive pulley that accelerates water pump delivering greater coolant volume to 1979-1993 5.0L engines without cavitation issues

- Auto Specialties underdrive water pump pulleys will help to deliver more horsepower by reducing parasitic drag

I would think a smaller water pump pulley would overdrive (same as the way it works on a supercharger)

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You are correct a smaller pulley overdrives. The cobra had a smaller underdrive crank pulley so Ford put a smaller water pump pulley on to keep the flow proper.
 
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