Which Carb Vacuum port to Blower Accessories (Vacuum Log) ... Pic inside ...

[Tim_in_NC]

Hi Guys,

Take a look at this pic and let me know which of these vacuum ports I need to use to route to my Vacuum log which will then feed all my blower accessories ... (boost gauge, water injection, MSD 6BTM, Bypass, etc...)

This is a 750 Holley ... one of the vacuum ports is kinda hard to see it's behind the fuel log ...

I would think that's the one I need to use and then I'll cap off the other, but I'm not 100% sure ...

https://static1.pt-content.com/images/pt/2007/07/750holleycarbvacuumports-1.jpg

Thanks,
TIM

[HILROD]

The upper one needs to be capped. The one on the base can feed all except the regulator. I don't know if I'd hook them all to the same port. Maybe a larger one hooked to a log. Check the back of the baseplate, or maybe tap off the manifold.

[Tim_in_NC]

Thanks ... I'm going to connect the fuel regulator to the Carb hat ...

What is the upper port used for ... is this for vacuum advance or something along those lines?

[HILROD]

It's ported vacuum, usually used for vacuum advance. Mostly on smog cars. I've never seen any performance cars hooked there.