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I've always thought that the Super Flow was the most accurate. There is is another one out there that is happy Vs a SF-600.
Whatever happened to the SF-1020. Don't hear much about it anymore.
 

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Discussion Starter · #6 ·
I have the Saenz d680 and superflow 750. The superflow 750 reads higher on the intake and slightly lower on exhaust. The saenz gets to 28 inch almost instantly not so with superflow.
So far my SF reads lower. I have always used the SF formula for my calibration plates. It is DIA x DIA x 13.29 x SQ RT of test pressure. As an example, my 2.500, 450cfm plate, flows 442.8 cfm on my SF. The reason I do this is because the rotating disc in the SF is a nasty hole saw square edge, and not a sharp edge design.
 
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