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Different fan pulley sizes

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Old Sep 16, 2008 | 02:16 PM
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Different fan pulley sizes

Sorry if this has been discussed before; I couldn't find anything in the search pages.

I have two 400 engines, one with A/C, one without. Obviously the crank pulley on the A/C engine has three groves, whereas the non-A/C engine only has two. The strange thing is the fan pulley is a full 1.25" smaller in diameter on the A/C engine. Anybody know (or could guess) why?

It's in worse shape than the (larger) non-A/C fan pulley, which I've already prepped and painted. I want to run A/C on the new engine.

Any suggestions?
 
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Old Sep 16, 2008 | 09:36 PM
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IIRC, the smaller fan pulley is designed to clear the AC 3 groove crank pulley. Otherwise, putting it on would be a PITA.
 
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Old Sep 17, 2008 | 09:14 AM
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The smaller one will turn the water pump faster.
 
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