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Help: SB & BB Water Pump Pulley's Same?

ilm65

ilm65

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Tom at Evans suggested I switch water pump pulleys on my 440 from current 6-3/8 diameter to smaller diameter to increase flow. The only H2O pulleys I can find under 6" are for small blocks. Are they interchangable?
 
The bolt pattern is the same,the backspacing may be different.Different size spacers are also available.I ended up with a few washers under the pulley for perfect alignment.
 

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I just happen to have had some pic's in the HEMI-ITIS archives.Glad that worked well for ya:tongue5:
 
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