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#1 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 250 vacum source
Yeah, that 250 Rochester should have two vacuum sources -ported and non ported. The higher one above the butterfly valve is ported, the lower one below the valve is engine or non ported. If you are connected to the top one, nothing will change until you are at a certain rpm.
I've tried both on mine but prefer non ported. |
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