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Ok I am looking at converting 850 to work on a Blower application.
From what I can tell the Power valve circuit is the only thing that needs changed?
 

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If its a Roots type of blower (Draw thru), then you can run it either way, with or without a PV.
Without a PV, you will probably need to jet up about 8 sizes to put the AF ratio on par with a PV enrichment circuit.
With a PV, use an anti backfire valve to protect it.
 
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