Intake manifold choices

Ok, ignore the 12-866 because it’s a by pass regulator. Here is a link to a dead head regulator. If you look at figures 1,2 and 3 you will see they show you can use that dead head regulator as a bypass regulator by changing the way it’s plumbed.

And that’s exactly what I’m trying to say. That’s all Holley did. Take a dead head regulator and change the plumbing and call it a bypass regulator.

A quality bypass regulator doesn’t just use a dead head regulator and run the fuel through it backwards

https://documents.holley.com/199r7914-3rev6.pdf