The Holley Carb Adjustment That Has A Twist - A Seemingly Simple Variation With A Big Difference 

100% correct. I work at Holley and completely agree with.

Anytime you lower the float you want to let it idle and even out the float bowl on its own. It does work with a sight glass style, you do not have to drain it but that way is definitely faster than waiting for the motor to consume it. Raising it is always way faster so I'll set a new carb up with them intentionally low so it doesn't take as long to get them set once you start.

UNCLE TONY, YOU ARE A WONDERFUL PERSON

I have about six carburetors laying around I have to start rebuilding I have my notepad and pencil ready 😂😂😂 keep it coming

Tony! You just solved a mystery I've been wondering about for 25 years! I got a pile of old holley carbs and parts with an old 63 Maxwedge I bought in the 90's, some of the sight plugs were drilled and tapped and were plugged with a 1/4-20 screw and rubber washer and no one could tell me why. Now it's obvious that with the whole plug out you adjust the level for the street and with just the screw out the bottom of the hole is higher and you're set up for dragging. Neat

I've adjusted sight glass carbs back down while the engine was running, had no problem with it. So long as the engine is sucking fuel out of the bowl, it has never been a problem for me.

The Holley clear sight plugs make life much easier.

I had this issue with an Edelbrock Performer years ago. Car would start and run but it blew black smoke out the exhaust under load. After about 30 minutes of driving it would stall and I wouldn't be able to start it again unless it sat for a day. In hindsight this was OBVIOUSLY a flooding issue but I didn't know anything back then. I replaced the Edelbrock with a Quadrajet that I knew was good and called it a day. Fast forward to a few years later: you dropped a video about how to use the Edelbrock rebuild kit and it encouraged me to buy one and pull that old Performer off the back of the shelf. Turns out one of the floats was just absolutely torqued so the needle and seat would never close. Previous owner did a real hack job on it and I didn't know enough to figure it out until you posted a how-to. What I'm trying to say is don't hesitate to do carburetor videos!

Great tips. I used the old holly carbs with the screw in plugs on our circle track car I found a business card or a finger covering half the the hole worked to set the floats. Once you got it where you wanted just screw the plug back in. On circle track cars i also remember modifying the floats so they wouldn't flood the motor on the curves by making them a wedge shape.

A benefit I've had working on so many holley carbs in the marine industry is that has been the only place I ever seen them use an anti-splash baffle at the back of the float. They make a world of difference when used on the track.

Your carburetor videos are some of my favorites. Your recent rear end videos were really good too.

Tony, i will watch every carb video you do. I learn something valuable every single time.

Yes!! Another Carb video!

I like your carb tuning tips. Really have been helpful for me!

Uncle Tony, you can never do too many carburetor videos, said the guy headed outside to redo his float height.

LOVE The Carb Vids!...Keep them coming.

I love your carburetor videos, I’ve learned quite a bit! Thanks Tony!

I can see people not knowing this info amd chasing the fuel level on a sight glass carb forever. Thanks Uncle Tony

Love it. Carburetors very educational. Thank you. UTG

Holley sells the clear plastic sight plugs to make the higher fuel level adjustment. You are supposed to remove them and put the metal ones back in when done adjusting. The problem is that many people left them in thinking they were a suitable replacement or sight glass conversion. Well they would eventually crack or break off and burn down the car. So if you do use them please dont leave them in.

Another good one.Thanks Tony & Cathy

I for one Love your carburetor videos !! Thanks Tony !

I'd love to see you do an in depth video on the T quad.

Thank you For clarifying Yes ive done that as you described I watch most of ypur videos Thank you very much

Tony. I appreciate ALL and ANY of your carburetor videos. Whenever you want to make them. Rinse and Repeat. I will eventually absorb at least some of your wonderful knowledge, Sir! Cheers, Chuck in Florida.

I came across this issue and thought the adjustment mechanism was broken. I could not get the float to go down. I then got it to work at another time and said to myself "it fixed itself" :) Great video !!!

Thanks for sharing, great information, noone actually explained exactly how to adjust the float level, I was 28 when I started my apprenticeship, so most thought I was 10 years into mechanic not just starting, I had general knowledge could change engines, change part's but not all the technical stuff, thanks, all the best to yous and your loved ones

Always been a Q-jet fan but my next purchase will be a Holley type carb. Thank you for the information.

Im all for more carb videos. The more i can watch before my engine is done thr better

Good video. had to laugh at the last bit where he says glass is nicer than having gas trickling out all over the motor...says the guy who squirts bottles of gas all over the engine looking for vacuum leaks..lol..

If you don't have a sight glass Saran wrap pressed over the hole works pretty good for an accurate reading, obviously you're going to spill a little gas once you have it adjusted but that's what paper towels are for

Like #99! Never knew that about lowering the float displacing fuel like that! I've always just had sight-plugs, but concede that the sight-glass is better.

Thanks Tony. this explains a lot.

Awesome!

love these videos

Great video, brother.

Thanks Tony, that’s some great insights there

My hubby drilled a small hole in the plug on the old style in the center and used it raise the floats, then replaced it quickly! With a solid plug !

Thank You Tony. Gonna add this to my investigations, process of illinations, why my car wants to lay over at about 5k. 750 vacuum secondary. Can't Gunfight with it doing that.

Great info, thanks! I have a new Holley 750 double pumper for my 440 that has not been "dialed in" yet.

I always installed “vent whistles “ on drag racing Holleys. They help avoid the flooding when exiting the burnout and doing dry hops.

Wow, i have da those sight window carbs and never dawned on me to adjust as you pointed out! GREAT INFO THANKS!

I would be happy with more carburetor videos! I want to learn all there is to know about them. Even if alot of would be irrelevant

Wow nice tips. Never knew that on the sight bowls.

Good Point on adjusting with a sight glass!!!

Awesome Tip !

Great tip 👍

Wait... I saw those metering blocks, is Tony going to join the shine side?

A whole 5 days for the next carb instalment? That’s an eternity away! Thanks Uncle, always been a Holley guy but never knew of the correct sight glass adjustment. I’ve been tweaking with a Street demon carb and though it’s not an out and out high performance unit; it’s got precision metering and tiny primaries.

Tony, you could do carb videos every day. I learn alot from them. Make sure to keep the 2 little gaskets handy for the set screw and nut. They rip if sitting for a while.

YES!! Another carburetor video!!!

We usually wacked the throttle a few times to use some fuel up but it was with an electric fuel pump.

I don't have any newer carbs but I thank you for your help GODSPEED

Thanks

AWESOME vid UT....great info ty....MOPAR 4 EVER.

Thanks!

Good stuff 👏 👍

I got something out of that. Thank you Tony.

thanks

Ok Tony I just put a message here and wanted to get back and say forget the question I asked you,I learned something,the billet block I asked about and I said they have the spot there,well it turns out they drill and tap and put an Allen screw in it that if you look with a magnifying glass or have good eyes you can see.put the right Allen wrench on it and spin it out and replace it with the right screw.this was much easier than I thought.thanks for the help Tony.lol

BRAVO

Carburetor is an art to adjust 💯👍

I'm working and I'm saving. There's a classic American machine out there somewhere just for me. 🤞 And I can't wait.

That is the one advantage uncle tony , not just adjusting the float but having the option to with a holley .... you can make it work on the street , strip or off road .

But but but EFI!!! LoL Lots of folks want learn carburetors, and have no where to start. Keep up the carb videos. Hatters be damned

Man I just done a sight glass today, should have watched this first

great vid. you can also adjust the level of a sight glass carb with the engine running. slowly lower the adjustment and give the engine time to burn some fuel, then the level will be stabi!ized.

I love carb videos

Always great spot on carburetor videos from you Uncle Tony AND looking forward to your next one! 🏆🏁

One old trick I used was to have someone lightly power brake engine and adjust to trickle out of flow plug. Seems like it gave me about right level for performance carb prior to sight glass. Always had a 4 gas analyzer to finish jetting, transfers, accel pump, power valve tining though. B4 days of AF guages.

There are never enough carburetor videos. I messed up with the floats and hurt the engine in my classic car. Hadn’t done it in 30 years, but still. Thanks Tony

Too cool tony

Love me a good carburetor video!

Cool!

good video my brother

PLEASE MORE CARBURETOR VIDEOS!!

I went to my garage, opened the 1961 Chrysler Newports passinger side door,, opened a bottle of really good wiskey and thaught. Uncle Tony,,, dont never ever forget Bruce Springsteen song Born to run. As of Holleys, , i dont give a damn.

Rev that engine a few times with the accelerator pumps to bring your level back down after you lower your float. Always do float adjustments in small amounts and allow the carb bowl level to to stabilize after you've used some of the fuel (Idling or revving). Good info Tony, Thanks! Cheerz!!!!

found this video while trying to adjust a holley on a 351 winsor in a boat. great tips along with other videos from utg on it. one stipulation i had was my carb had no screw on top for float adjustment! im assuming its a fixed hight float version

Mr. Tony I wish you was my uncle you're so smart one brilliant human being you are my God

Good, another carburetor video!

I love the carb videos. I did not know that it was a racing setting and a street setting for the floats but it makes a lot of sense that the extra fuel needs someplace to go. My car has always had fuel issues and I notice that when I cut the pump off while the engine is running as the fuel gets lower in the sight glass the idle gets better and the 440 runs smoother thanks again Tony.

NOT ANOTHER CAEBURETOR VIDEO! Just for you, UncT!

yes another carb video :D

Thanks! Take the weekend off (that's two days...)

Yay another carby video

Six Pack outboard carbs with the sight plug hole lower than the center carb. Always used a temporary clear sight plug to set the fuel level to the center of the sight plug hole. I wonder how many people do not realize the difference and have issues with low fuel level in the outboards.

I used to have a Rambler American with a 199cid straight six. It had a single barrel carb. The repair manual said they used, I believe, 52 versions of that carburetor. Guess they felt a need to change weekly!

I am doing the Zenith carb on my Allis Chalmers One Eighty this week.. its been having some issues. Simplest carb I have ever seen outside of the reed carbs on glow engines for RC aircraft.

Thats great news .

I used edelbrock carbs. Not as easy to adjust floats on one of these. But once done,they work well.

Maybe I miss the episode but you never even mentioned the nitrous on that 361 that was the 361 correct

I ❤ Carb video’s … Just a Ford Guy👍🏼

I never messed around with Holley carbs.. crazy huh… 40 years of messing with engines.. I acquired a quadrajet replacement spread bore Holley .. NOS 750 cfm. Now I have some more basic knowledge in case I use that carb on one of my Buicks… however I am one of those quadrajet nuts… 😁

This was an Excellent explanation Tony! Thank you.

i dont mind the carb videos love em just needs to have some alternate brand show how too. rochesters are awsome carbs too

More carb videos!!!!!!!!!!

Strangely enough, as a GM guy who has always had AFBs or Q-jets, I needed this. I just bought a very old Corvette with a Holley. I was about to start looking up videos on youtube ad I saw that UTG just uploaded. Thanks Tony!

Can you do setting up carburetor for turbos?

UT could you do a video on summit carbs ?