Fine Tuning Holley Carburetors For Dual Quad Intakes

Our buddy Andy Wood (Unity Motorsports Garage) takes a deep dive into getting maximum power and economy with multiple Holley carburetors.
But what he lays out here applies to singles as well.
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*SOCIAL MEDIA:

[bunter]

9 dislikes from the Carburettor Magic Circle who don't want their secrets given away for free. 🧙‍♂️

[coopstain]

i love this, he basically made every passage on that carb tunable, if theres a hole theres a jet

[steveadams]

Andy is a guru at explaining!!! Makes it very easy to understand. I'd love if you/him could cover dual quad setups for a blower application.

[needmetal]

I'm glad you've found some good guys to collaborate with. His vacuum syncing tool is smart.

[williamhowland]

Anyone that didn't subscribe to Unity after the last video is not watching this to learn. It is immediately obvious Unity knows what he is talking about. Great job as usual and Thank you, thank you, thank you for introducing us to the Unity channel!!

[kevmay]

I tuned my main circuit like this on my 408 stroker with 800DP. put in power valve block off and square jetted until I was running ideal A/F for WOT(12.5ish). That put me at 84s. I then sized the front jet until I got the lean cruise that I wanted (mid 14:1 area). That put me at a 68 main jet. I then sized up the PVCR to resquare the primary side to the 84 size in the back. I don't get his mileage but I am not running vacuum advance and don't have any overdrive. Car runs great. Nice and lean at cruise without cylinder wash and giving up nothing at WOT to get that. This was a great video. Love what he did with the transition slot and idle circuit.

[howabouthetruth]

Man, THAT is some impressive knowledge. And 16 mpg from a big block, tunnel ram, and duel quads that runs 11's in a truck weighing 3, 600+ lbs is nothing short of astounding. ( The EFI guys will be I can hear all of their sabre rattling already, lol. )

[InuranusBrokoff]

Hey Tony, was late, but saw the new shop. Things are about to get interesting.

[pablojanski.]

Being a professional carb builder and tuner, IDK how many times I see someone do a carb video that I can't watch because of bad info.. Andy Did a great Job! and as he said, you could go for hours. emulsion setup, air bleed tuning ect ect.. another important factor, that actually should be done first is, Ignition timing.. If that isn;t right first, tuning the carb can be fruitless. Great Job andy! And Thanks for the great content UT.

[kurtzimmerman]

andy really knows his stuff when it comes to carbs, induction systems and engine building! that why I always told everyone to watch this guy. he's sharp!

[denniswallace]

I work at Holley. I started in assembly. Worked into cnc machining metering blocks and now I am maintenance keeping the cncs running. We set ours in kinda the same way. With that said we have full vacuum through out the plant so no need to have running engines. Just for info we sell metering blocks with a range of specs.

[edwardsmith]

Way above my Pay Grade, I can't even raise chickens or keep house plants alive. But I do appreciate some good plain speak on these matters. Very cool video...I'll pass it along to some buds of mine.

[ericdeyarmin]

8 barrels, 8 cylinders equals all the fun! With a pick of a dual carb setup. That would be a awesome shirt

[peteZ]

Great stuff! Like Andy, I've seen others go deep into the idle and transition circuits, tuning with custom orifice sizes and get great drivability and fuel mileage from a holley. Some of the higher-end Holley and Holley-style parts come with those circuits tunable with small jets.
One point of clarification. When Andy is saying "Drill and tap for six thirty-second" or "eight thirty-second" he doesn't mean 6/32" or 8/32" but #6-32 or #8-32. That is, #6 diameter, 32 threads per inch, or #8, 32 threads per inch.

[ianshaw]

Thank you Uncle Tony for some refresher on what i already know but cant stop watching becouse i always learn something from each episode

[dartvader]

Now i need to find a good used dual quad intake! Great video

[kenleppek]

That guy has forgotten more than I'll ever know...Holy shit.

[richardturk]

Andy brought out a few things I was going to say about smaller jet sizes to use but he said it much better. Great stuff Tony.

[Repete]

So glad Andy is out there. He really went to the detail in this explainer. Turns out that the carbs he got to really work had to have idle and low rpm fueling reduced below the available settings the carbs arrived with. He showed where he did the changes and explained the why of it.
I am looking into a dual 4 barrel setup and this just made me feel a lot better about it.

[pristburgess]

Definitely one of the best videos ever for tuning