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Old 01-09-2012, 02:47 AM
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Crank pulley bolt pattern?

Hey everyone,

I have a supercharger crank pulley sitting in my garage and I'm trying to figure out what its for. There are no markings, its aluminum 9" dia 10 rib. Its a 3 bolt and approx 3.1875 oc (measured with a ruler)


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Old 01-09-2012, 08:38 AM
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By 10 rib are you referring to the belt cogs? I have to say it's very old, or major overdrive at 9 inches diameter! Blower pulleys aren't upper/lower specific, (unless you're talking about a dampener...), you can change them to alter over/under drive ratios/boost. Today's blower pulleys have like 32 to 39 splines for the older 1/2 inch pitch, and 50 to 63 for newer style 8mm pulleys. Put up a picture.
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Old 01-09-2012, 02:56 PM
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Its actually a 8 rib, as in 8 rib serpentine belt pulley. I'm pretty sure its an aftermarket pulley for a Eaton blower. From doing an image search it looks pretty similar to some of the Kenne Bell crank pulleys.

I'm trying to figure out if the bolt pattern is for a SBC? Ford? ect??

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