fan

On a flathead you can drill out the rivets and replace them with grade 8 bolts,I did that back in the 60's when I ran dirt track in a '50 Ford,not sure but I think I used a 17" fan like this http://www.summitracing.com/parts/FLX-1317/ be sure and measure the old fan to be sure I'm right on the diameter.
 
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