Troubleshooting Holley Vacuum Secondary Function

We show you some simple tip and tricks to troubleshoot and fine tune you vacuum secondary

[NightWrencher]

Hey man! Great to see you back on youtube! I watched all your old videos last year and it really helped jump start my curiosity with carburetors. Just wanted to drop in and thank you for all the great info you put up here for us!

[TheSaxon]

Thanks Randy! Need more of these vacuum secondary videos. 🍻

[Bigeu]

Great way to test with compressed air over the ventury hole.... another way i've seen here on YT, there was a gentleman that used a very powerful shop vac, he turned the vacuum on, then placed the end of the hose to the bottom side of the carburetor primary side that has the vacsec draw hole, and it opened right up, it was like seeing a simulated high vacuum load of an engine.

[erikturner]

I like double pumpers for the track. But lately I'm leaning towards hot STREET performance so I'm looking towards the Vacuum secondaries for for all around performance and help with mpg as well. Appreciate the videos! 👍

[Mynextproject_]

I really enjoy all your videos. I appreciate any Vacuum Secondary info as well as the Double Pumper info.

[halfzacstunts]

Got a 460 jet boat not getting into the secondaries. Thank you for the video. Going to pull my diaphragm off as soon as I’m off work and check it out.

[dondavies]

Great videos Randy. Would be great to see something on the Mopar 6 pack setup

[smitteninthemitten]

Great video. Extremely helpful. How do you open that clean out port that you showed? Mine has what appears to be a ball bearing in it.

[gregpratt]

Thank you Randy I do have a question is there any difference in the metering plate from say a 390 4 Barrel or 600 or 750 if you got a 600 and that's what you're trying to build but you have a metering polite from a 390 and a 750 would you gain anything from putting the metering plate in it. Also do you gain anything bye Milling off the choke horn.

[cuda]

I have a holley 750 vaccum secondary it has 2 vaccum passages one to primary and to one to the secondaries
I read somewhere that if you plug the passage for the secondary it will open faster ?

[artjones]

im doing a 3310-4 right now...got it for free.. i took it off the engine myself a non runner it had a lot of crap in the throttle blade and they did not open...i soaked it for 2wks.. in a solution i made...got them free with out having to force them...made sure i didnt bend the blades....the secondary blade dont open as easily as the primary blades...its not together yet...will it work properly or should i relace the whole throttle blade assy...apolligize for so long....but i wanted to make sure you under stand my question....that i worded it properly??...any reply will help thank you

[SupermanBPR]

Have you ever seen a primary metering block with no emulsion holes? I have one and not sure if I need to get a different one or use it for my 670 cfm Holley.

[custom-okpd]

Hello Randy, thank you for the videos. I have an off topic question. Can I plug the choke vacuum port on my 670 street avenger? Seems like a vacuum leak there and I cant find any info it. Thanks in advance,

[pierre-yveslavigne]

Hi, my 80457-8 (600cfm) does not have that hole at the bottom of the ventury...i look like the secondary have vaccum troughs ventury circuit inside the main body.🤔