Anyone recognize this Ford triple crank pulley?

[Jason in TX]

I bought this pulley at Hershey last year as a blower pulley for a flathead.

I wasn't paying attention that all three pulleys weren't the same size. So, that started me thinking that perhaps this was a bus pulley with two belts for the dual water pump belt arrangement, and the third smaller belt for an accessory item.

Anyway, anyone recognize this pulley as a big truck pulley, ambulance pulley, bus pulley, etc?

 

[Binx]

This site shows an original 3-pulley but not like yours.

http://www.fordgarage.com/pages/generatorchart.htm

Edit: But since I now realize you are talking about main pulleys and not gen pulleys, my comment is worthless and I do apologize since I can't seem to delete it...so here we are...

Lonnie

 

[scicala]

I was thinking maybe for a flathead V8 big truck or bus with air brakes that used an air compressor.

Sal

 

[Jason in TX]

I didn't know about the stock ford triple pulley generator! Now I want one!

Anyone have one?

 

[Newc]

Hi; I vote an air compressor for an air brake trk. Newc

 

[hotcoupe]

I don't believe that pulley was used with the '37-'41 truck pumps. The grooves in the truck pumps are adjacent to each other, your pulley has a space between the grooves that would be used with the truck pumps.
Tom

 

[flatheadmurre]

Since it doesn´t have a built in spiral for oil it looks like a newer style pulley.
Diameter of the hole ?
The French flatheads had 3 groove pulleys...not sure how they look.