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Discussion Starter #1
Anyone know anything about a bushing that goes in the fan spacer on a 66 V8? Mine never had one but I am being told that one belongs in there. Can't seem to locate the part.
 

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I recently changed my '67 from a 2-core to 3-core radiator.
I went to local parts store to pickup a generic 2-1/4" spacer
to replace my factory 3" part. There must be a couple
common sizes for the snout on the water pump because both
the Hayden and Derale I looked at had a larger diameter
female pilot hole than the Mustang water pump but both
included a bushing / insert that made everything mate
together properly. Maybe that is what OP is seeing?

Bronze colored bushing in:
https://www.summitracing.com/parts/der-34540/
 

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A factory Ford fan spacer does not need a bushing- the spacer is machined to fit on the water pump "nub" tightly.
Some aftermarket fan spacers may include a bushing because although most water pumps have a standard 5/8" "nub" there were some such as Y-block Fords that had a larger "nub". The aftermarket suppliers may or may not machine the hole for the nub to the larger size and then include a bushing to use that spacer on the smaller nub. I just bought a Hayden spacer earlier this week and it was machined for the smaller nub. If I wanted to use it on a Y-block with the larger nub I would need to drill the hole larger.
 
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