M37 Fan Blade

[dispatcher1011]

How many fan blades should be on the fan of my '54 M37? Presently, it has a 6 blade fan, which does not interfere with the shroud at all.

Am I getting a significant amount of drag from the extra blades I suspect I have?

Who knows when or why it got swapped out; what is correct? And is there any reason I should change it?

 

[Roller]

I believe the Canadian trucks had 6 blade fans. My truck ('52) had a 4 blade fan. I would use the 6 blade if I had one.

Frank

 

[Carter]

US trucks had 4 blades.

" And is there any reason I should change it? "

You mentioned "a significant amount of drag", that would be reason enough for me if the cooling system is stock and in good condition.