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Is there any difference to the bolt pattern on a small block water pump mounting flange vs. a big block water pump mounting flange? I am asking as I found a big block short water pump pulley that is exactly the diameter I am looking for, but I have a small block with a short water pump (measured from the mounting area on the block to mounting flange on the pump and it's under 6"). Thanks!
 

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If the bolts for the fan line up and the belt grooves line up. It should be groovy baby!:yes:
 

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The pump will not interchange the best I remember. The pullies will work as long as they line up.
 
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