Holley Carb Secrets... Get the most out of your Holley!
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- Опубликовано: 15 окт 2021
- We look into the Holley Carb and I talk about the different circuits and how they affect the fuel curve on your engine! I include many of my dyno tests and real world experiences that i have learned over the years that has shaped my understanding of the Holley Carb design This is a part 1 of 2 because there are alot of things to talk about regarding these Holley "Secrets" I hope you get something out of this and stay tuned for part 2 which will be coming up!
#Holley #Carbtuning #Davidvizard
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Thanks for Watching
Andy 
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Lol nice, your video has the same name as my holley play list. When I was starting out, I watched a lot of your older carb videos and they really helped me understand Holleys. Now I build 100% tunable carbs for myself and know more than pretty much any "old timer" at any car show 👌
Thanks, yeah I have come to conclusion that you can make a Holley do everything that you want it to do! Thanks for the kind words... I know some of the stuff in this video was covered in my older stuff.. but I wanted to include some of my Dyno and track testing from years back... Part 2 goes into things I've never talked about.. Thanks again for Watching!
Andy
Nice info on boosters
Thanks for the kind words and for watching
Andy
The timing of this is so perfect. Can’t wait for the 4 corner idle info. I’ve got a 650 DP that is in desperate need of a freshen up. Thanks
Ive got a 4 corner 800 that needs help to.
Thanks for Watching! Stay Tuned for Part 2...
Even though I haven't raced in many years, I still enjoy watching videos like yours. Thanks Andy & keep the Fords a fly'n!❤
Thanks for Watching Robert!
Andy
Best carb video I’ve watched on RUclips
Thank you for the kind words and for Watching!
I love it when someone figures out how to make “trash” work like a dream. Good video Andy looking forward to watching part two.
I love Holley carbs, but it is easy for me to dial in and like my guitars tune for atmospheric changes. My wife and son only complain about how finicky they are. I have to admit that a well set up AFB 800 Edelbrock is easier for them to live with.
The Holley is far from trash you just don't know how to work on it ,go to the track and you will see the fastest cars use the Holley
Carburetion generally yields more power than EFI when they have a spot on tune. They tend to outflow air wise an EFI setup.
This is a great how-to and WHY video, Andy. Thanks so much!
The exact same throttle blade button head cap screws as I put in my Holley more than 25 years ago. It also had the brass feed restrictions that I also made myself before I had the RUclips, social media or the internet.
I agree... Been doing this stuff for years, many folks haven't ever heard about these tricks
I have a few ( ok More than a few) vintage Mx bikes and carb tuning is both straightforward and at times challenging. “ You are the computer “ says it all. I ran double pumpers on the street when young and just re jetted , changed and adjusted accelerator pump cams etc and got them to work nice . I was too stupid to know I should’ve failed at it .
Hello James, I do not think you were stupid, just a little lack of knowledge. That can be a good thing IMO. A lot of guys/gals won't even try to get a project done because they are afraid of failure and think I can't do that, it is too hard or complicated. Sometimes, ignorance is bliss and that is how you learn.
@@robertclymer6948 that was more tongue in cheek. There’s a quote attributed to I think Dolly Parton -something about being to stupid to know she was supposed to fail in the music industry.
Something I learned recently is they make a throttle shaft bushing tool kit to repair worn throttle shafts. It comes with the drill bit and a brass sleeve, and it looks super easy to use. I'm going to fix my vacuum secondary spread bore 750 demon. And if it works good it will save a buttload of old carbs
They work great. I rebuilt my Qjet with one and it was like having a new carb.
Im a machinist been putting bronze oilite bushings in throttle plates for years they will last for a very long time.
@@adamballinger1358 That they will, and for any carby for that matter.
In Australia I have been given a kinds of carbs over the past 40yrs to fix.
Without r replacing shafts, and associated issues like getting brass screws out of butterflys.
Usually I get them when people have tried to replace shaft and of course it's bent coz of a hammer on the end of a screw driver.
Sigh usually those carbs arrive on Friday afternoon 🤔🙄😏🙂
I'm a Qjet lover myself. I'm also a machinist and have repaired several worn throttle shafts using bushings. It makes them better than new actually.
Great Video...David is the man!! You had an amazing mentor..
Thanks for the kind words! David is the man... I have learned so much from him over the past 15-20 years!
Thanks for Watching
Andy
Andy I always thought i was a Holley guru and for the most part I have been but buddy there is a boat load of information I’ve learned from you and for that i thank you sir……. You are the man 👍👍👍👍👍👍✅✅✅✅✅✅❤️❤️❤️❤️❤️❤️
Outstanding tutorial, I thought I knew plenty about the Holley, now I know more, keep the faith brother. Keep on rocking that BLUE OVAL.
Ive always lived in mild climates, most of the time I remove the choke plate and toss it like a frisbee, pump the gas pedal a few times with ignition delete, crank the motor (my 2,3) then fire it up
On an engine that's making good idle vacuum, ya know, more of a daily driver type, the IFR wire trick actually covers the transfer slot tuning too, and works best if the wire is sized to the transfer slot requirements. This is because the vacuum at idle and cruise on a stocker are much closer together than something cammed that only makes vacuum at cruise, which really negates the need for a separate circuit. Usually the idle circuit still has plenty of fuel left to do what it needs to do. I know your content is more racing oriented, but this could definitely still be relevant to lots of your viewers
And don't think I'm trying to just smartass you here, you're actually the guy who turned me on to this idea in the first place! I just took what I learned from your channel and applied it to something much, much more mild than Casper. The end results I got out of my Holley outshined the Q-Jet it replaced in every single way. Economy, power, burnouts, you name it... These carbs can be made to work as good as any other in a daily with enough patience and attention, and you're one of the folks I have to thank for guiding me to that point. Thank you for the knowledge my man
(And to those of you still reading this far down in this now embarrassingly long comment, if you wish to try the IFR wire trick, electric guitar strings are the absolute best for this. Precisely measured single strand wire available in .008" in diameter and up in .001" increments. Seriously can't beat it for hardcore precision tuning on a daily)
Hey would you do any modifications on an older Holley 4160 on a stocker? I have a stock 351w and just want the best out of this carb, economy, reliability,power torque.
just found your channel over the last couple of days looking into tunnel ram tuning before getting one, love all the info you have. subscribed!!!!!
Thanks for the kind words and Sub! I'm glad you got something from it....
Andy
Getcha notebooks out! KING Andy isa speaking!
Thank-you so much for sharing your knowledge with us; you're a great mentor yourself and I reckon David is proud of you, (I've been a huge fan of DV for some time now).
Hey, can you share with us where you source the plugs that you use for circuit restrictors?
Thanks for the kind words! You can go to McMaster-Carr and the main sizes I use are 6-32, 8-32 you can get the taps from them as well as the pin vise index size drills...
Thanks for Watching
Andy
I always loved tuning on a carb, especially a holly. Nothing Beats a good book on hollys. Thanks for the booster info. I never totally understood the reason for different boosters but now i do. Thanks andy love the videos
Thanks Mark! Hope all is well your way..
Andy
Thanks for teaching about Holly
Love the video! Thanks for the great information!
Thank you very much Andy for sharing your information and hard work with us! Greatly Appreciated and looking forward to the next one!!!!!
Thank you for watching!! That is why I continue to do this.. passing on what was freely given to me!
Andy
Thank!!! You and D V are god’s of motors and you guys talk real. I can’t wait to see your next video. I have been going nuts till it comes out. Thank you again so much sir . Now I wish I had a Dino to test on to put all this together. Again thank you!
Great video looking forward to part 2 and more!
Awesome Andy. I totally enjoyed the tech on the Boosters and application s. I hope you continue to grow this channel. I built my uni-sync carburetor hat after watching your video. My 500" Mopar dual quad set up is now 1.1:1 ratio and has some serious gains in performance and driveability. Thanks for sharing your knowledge and experience, I hope you don't stop my friend. God bless.
Spot on, Andy! Excellent info and well presented. Can’t wait for part 2. Two thumbs up!
Thanks for Watching
Part 2 will be just as interesting..
Andy
Awesome video and job Andy.Look forward to the next segment
Great video. I like the drag footage and go-pro video. After helping UTG solve his problem based on phone call it is clear that you know what you’re doing. Now I need to go look for your other carb videos because although I’m old enough to have grown up with carbs I’ve never been able to tune one. Never to late to learn. Thanks again Andy.
Mike, thanks for the kind words!
Andy
I found the part about boosters very informative and good to know, something I didn't know. I have open the air bleed holes on some holleys to get them to idle without burning your eyes with unburned fuel.
Thanks Stephen! I will cover the air bleeds and the connection to the IFR In the next video
Andy
@@UnityMotorSportsGarage Thank you, I will be looking forward to watching them and learning more about holleys.
Thanks Andy. Gonna have to watch this one a few times! A little over my head but I understand the concept. Awesome information and thanks for sharing. Cheers from Motown.
Thanks Andy! Quality content! Not many people get in depth on carb tuning all makes sense. Thanks!
Anytime... I'm glad you got something from it! Thanks for Watching
Andy
Great tech as always! Thank you Andy!
Thanks for the kind words!
Andy
Really helpful, especially the booster info. Thanks!
Thank you for doing the reboot of this topic. I've got the Holley 4150& 4160 red book and DV's How to Super Tune and Modify Holley Carburetors. I've gone through the red book and half way through DV's book. I will say that watching these videos is really helping to put the rubber on the road. I'm a kinesthetic learner, so the more hands on I get the more it will make sense. For not it's a virtual hands, but I'm looking for good junk carb to take apart and mess with to help with that learning process. Trouble is people want too much. I'd love to find someone that has a cracked carb with warn out shafts and give then $50 for it so I can play and learn. It's the details. How to remove the transfer slot restricture and how far in do you drill? Obviously it is not all the way though, so there must be some measurement that needs to be learned or communicated.
Thanks Andy! Real informative. I have never played much with boosters, different types. I have a 1982 fox body with a 351, always smells a lot like those "cap" guns we had as kids, when you give it the gas. I've messed with jetting, and the idle restrictor, accelerator pump.
Loved this video. Thanks Andy. I read DV’s Holley book. A year or 2 a go I went from a performer to an rpm air gap. I couldn’t get rid of a stumble using my straight leg 600 or my down leg 750 after going to the air gap. I tried tuning the transfer slots, I tried everything! I saw one of your videos where you touched on this subject about boosters. So I ordered a summit 600 with the annular boosters. Problem solved! Thanks again Andy.
Your videos are awesome. Thanks for your knowledge. Lots of how too info, I look forward to watching your vids. Your a good man , God bless you and David Vizard .
Thank you for the kind words! I ha e learned so much from DV over the years...
Andy
Thanks Andy, that is really interesting. 👍
l glad you brought this up as I have experienced some of this . I was at the finals at San Antonio years ago running a 68 Camaro power glide with a 427 and a 9 inch . I took the 1050 off it and carried it to the holly tech booth . He removed the float bowels and installed new gasket adjusted the floats and installed 2.5 power valves . That the only size he had . I never for got . Later on I took my 302 that had a lot of cam and a decent heads off a g gas car that had set the record once and installed it in a econ rail with a power glide . Sure enough it ran rich at idle in gear . I drilled the holes in the throttle plate and installed the wire in the mettering plate as you suggested and the 2.5 power valve . I ran reo pumps and I used the trial and error on the nozzles . That fixed the idle problem . I talked to T Willy at isky and he said I could use less cam as I was running a 600 isky roller . That was a long time ago . If I had it to do over I use a ls and a lot more cubic inches . Thanks for the videos
Fantastic vid as usual Andy. Incredible seeing the boosters pass fuel in pulses as each intake valve opens!
Thanks for Watching! It's pretty wild to see it in a slow motion vid... You can learn alot from it really...
Andy
Awesome video ! Really appreciate your knowledge and sharing it with us ! I remember my dad always saying talk to the older mechanics at a garage. And I’m not saying your old ! And asked why he said that. He said because things aren’t always stock and to understand exactly how things work and what they need to work correctly only comes from experience !! And you, my friend, clearly have that kind of experience !! Always appreciate your videos Andy!! Take care
Thanks for the kind words Tony... You are right. These things come from experience and testing. Finding out what works and what doesn't.. but I've always been one to have to figure out the why's! Thanks for Watching and sharing your Dad's story!
Andy
Nice work dude. Thanks for sharing the knowledge.
love your videos I bought David's book on carburators about 35 years ago when I was running the same intake you have on mixed up boss it helped alot getting my cleveland to go in the 9's in a 53 studebaker . swtill have that cleveland might put it back in service in a 65 falcon . but I do appriciate your videos .
Thanks for the kind words Michael! I can say that I have been taught by the best... That's forsure
Andy
Thanks for passing on the knowledge bro!!!👍🤠👍✅🇺🇸
Hi Andy, thanks for sharing the details, I just pulled the holleys off my impala to put restrictors into the carb body's. Almost operating perfectly just isn't good enough now that I understand how to limit the flow to the off idle circuit. Can't wait to see Casper running again.
one the best videos on a holley carb
Thank you!
Andy
@@UnityMotorSportsGarage welcome
Outstanding video Andy !!!
Mr. Vizard is a total genius!!!
Yes he is... He has taught me so much over the years! Thanks for Watching
Andy
Thank you for your videos they are great. I'm learn a lot
Thank you for watching and the kind words Marco!
Andy
Yeah, definitely like it. This is very helpful video.
I suddenly realize I don't even know how to change jets !!!!!! Great video, and one sure to be referenced by many !!!!
Thanks Brother! You have it going on with the Drag Truck... What is a good way for me to contact you?
Andy
Thx for the explanations
Thank you for watching!
Great content topic Andy.
Thanks Andy
Having DV in your corner is awesome! Great video! I'm a recent subscriber so I'm catching up on the older videos.
Thank you for your insights and video 🙂❤👍PS: Great show love this tech stuff on old fashioned carby cars
Thanks Jimmy!
Andy
Excellent basic training. It's been a long time since I had to tune my old 650 and now I have 750 holley needing a tweek atop a 428CJ
Andy, thank you- I've been trying to get a Holley 800 cfm spreadbore to work on a heavily cammed 455 Olds. I kept switching parts, testing, not knowing what I was doing really. I keep going back to the quadrajet, as I was more knowledgeable of its circuits. This is going to help a great deal, sir. Part 2 will be very helpful and I look forward to it also.
Thanks for the kind words and watching.. hopefully it will get you in the right direction!
Andy
Interesting and good to see someone else who ain't afraid to dig into a carb. Ran a 660 Centrafliw on my 72' 400 4spd RR. It took a 4.30 rear but it ran 11.88 best with a 9" slick. Not exactly alight car or high HP combo but working out the carb was the best thing I did. Had a buddy that had an early version of a portable emissions testing setup who helped me out alot.
Yeah, I've never been afraid to try something even if it was wrong... Sometimes that is the only way to learn what works! That sounds like a sweet ride! I love 71-72 RR's
Your use of editing and camera work are excellent and really helps clarify the information that you are presenting.
Thank you for the kind words! It's something that I strive for in my videos..
Andy
Thanks Andy! Great tuning info. All carbs have to be dialed and the knowledge out there is really getting better.
Carbs make more power than injectors because they have more time for the fuel to pull the heat out of the air. Injecting at the intake ports leaves no time for the fuel to cool the charge air. Pro Stocks run the injectors way up on the intake. That's how they finally got injection to match carbs in Pro Stock. Pro Stock is the most finely optimized racing engines on earth. Even more so than Formula 1 considering the limitations 500 cubic inch pushrod platform. I've been pirating knowledge from those guys in interviews etc, reading between the lines with Warren Johnson interviews etc. I just found out about DV last year, a real genius!
Very impressive work---thank you! I have a pair of BBC 565cid engines with single plane intakes with an air-gap design under the runners.for an offshore boat I have with Holley 950cfm hp carbs....but I bought them way back in 2004/2005 and they came from the Holley factory with the stock down-leg boosters....I also run a phenolic 1" carb spacer and after I come off plane and off plane to idle speeds and lift the hatch I notice lots of condensation beads of water all around the exterior plenum of the intake manifold---I also have hood scoops, so the engines get all the cool intake air they want---but I think I am going to get some of the Holley "Stepped" down-leg high gain boosters. What great research from you and David V....thanks again.
Thanks for the kind words and for watching!
Andy
Your carb tech is great, love Holly's. But with Holly's every where,its easier to get the right carb for the right AP. Great video.
GOOD STUFF!
Thanks for Watching
Andy
Excellent explanation. Great content.
Cheers
Thanks for the kind words! Thanks for Watching
Andy
Good job Andy
Thanks Billy! I'm glad you enjoyed it...
Andy
I have a Fox 302 bracket car with 650 DP your videos have really help me, looking forward to learning more tuneing tips. Jetting for different weather would be nice.
For different weather, this is where heated intakes really shine. If you can make your car perform with a hot intake, you'll be changing jets a lot less when the weather takes a turn
Thanks 4 sharing this, and others
Steve thank you for watching!
Andy
I sure like finding information like this.
Thanks Hugh!
Andy
thanks , some good info.
That solves my curiosity about why the fuel pulses out of the boosters as well as confirms I was seeing it right
They say a picture is worth a thousand words! Thanks for Watching!
Andy
Great video Andy. Love any info on carbs, since I am so old school. 👍👍
Thanks Brother!
I have a ton of DV books, for decades now. But maybe it's they way you described xfer slots and especially Boosters...I finally understand what booster and why. Also didn't know they actually pulsed! If you put this together on DVD or something, showing the different systems, and mild to wild carbs....I WOULD BUY IT. Hey you know DV, package it up, i'll buy it.
Thanks for the kind words Mike
Andy
Great info. Saving this vid
Thanks for Watching Randy
HI ANDY THANKS FOR ANOTHER GREAT VIDEO
Thank you Mike for Watching!
Oh and have to mention this was with the first of the Edelbrock Tarantula manifolds. I had done the oiling system mods recommend by Chrysler for engine seeing 6500 rom or more with a milodon 7 qt pan.
I was hoping you would add something like this to your library so I have a good as gold reference for doing what I need to do with my setup when I get it all assembled. Thanks for your video Unity Motor Sports!
Thanks John! I believe part 2 will be more telling..
Andy
@@UnityMotorSportsGarage I enjoy your video and it is so informative to the point where a simple kinda guy can understand how you explain in leyghman's terms. I'm a watch/read then hands on kinda person. I have been told to precise and too perfect? I'm far from perfect but like to do things the right way and then you only have to do it once or twice, depending on the task. Let me know what you recommend for carburator pair, and cam so I can get you some money rounded up and send it your way. That way when you do get or find the right thing you are able to act on it. Thanks for your help, time, and the college courses on how to do this right. Most don't go in to a fraction of the details or anything that you might need to do. You guys are the best! Great evening to you Andy!!!!
Awsome info thanks
Thank you for watching David!
Andy
This will come in handy when I replace a 2 bbl. carb with a 4 bbl. Thanks.
great info andy
Thanks for Watching!
Andy
Super helpful. Perhaps more detail in the future on actually drilling tapping and prepping jets to make changes to the transfer slot feed, so we can see how it’s done.
I will probably do that down the road! Thanks for Watching
Andy
Interesting discussion here on boosters. One thing your video doesn’t mention and 99% of other’s don’t (not a bad thing) is mixed boosters. I learned this recently but I didn’t realize Ford actually used annular primary and down leg secondary boosters on their Holley carburetors that were used in the final carburetor Mustangs. I would be interested to see a carburetor test with that kind of setup on a tuned aftermarket carburetor.
When done right they work well... Ford did it for better driveability with the 4180 carb .. I've mixed boosters on intakes that have distribution issues too... To mix boosters you need to test,test,test to get things perfect... Thanks for Watching
Andy
8:00 I use old guitar strings, they come in different diameters so you have some adjustability.
Another great informative video from Unity Motor Sports. Should me tackling Holley carburetor tuning easier, and a much less daunting task.
Thanks! That is my goal... To make carb tuning a little less intimidating as it's not black magic
Andy
The 400 cu.in low block Mopar was new and not much race stuff was known so all I had was whatever 383 stuff was available.
That's all we need, another video on holley carburetors.
Joe, I believe this one is a bit different... But I will let you be the judge on it
Andy
A 2 part white epoxy called Marine Tex works great on carb issues . its heat and cold proof and with stood a 48 hour test submerged in gasoline. I found it works great for re-gluing the fuel caps back on under the plastic body on thermoquad carbs . I bought it on amazon . 17.00 white box with red and blue lettering . you get a white paste in a small container and a clear glass vile of clear hardner . it's even sandable get stuff .
David Vizard is a genius!
Yes he is... I'm lucky to call him a Friend! Thanks for Watching
Andy
New sub killer info looking forward to more videos
Cant fathom having vizard in your corner,,,how cool
It is pretty awesome... We have done some amazing stuff together over the years! He is a great friend of mine that is forsure! Thanks for Watching
Andy
And yes I like your video it very informative
I’d like to See a video of the Ol Blue. I remember reading about it way back when.
John, I actually did one a good while back... You can find it on my channel
Thanks for Watching
Andy
I ❤ Your hat Andy...
✌😎🇺🇸
Thank you for finally taking the mystery
Out of Holley tuning can you cover
1050 dominator idle circuit has totally
Different idle metering block
and could these tricks like
The 4150
Cool vid 👍🏼🏁
Totally agree on the booster selection✅
Have a story of my own on that topic, wrong carb / booster was worth almost 5tenths back in the day on my na 4V Cleveland.
It ran strong but Once the right carb was put on, my god!....... was like a 100 shot of nos lol
night n day difference 🤷🏼♂️🏁
Thanks man... The right carb can make all the difference!
@@UnityMotorSportsGarage 👌🏼✅🏁
Great video as Always Andy, thank you very much for really getting into the carburators I love them and its always nice to have more knowledge on them. The newer Holley xp carbs seem to have all the bells and whistles except annular boosters what do you think of them do you think that they are worth the $1000 price tag? And how easy is it to change the boosters?
They are great carbs! Are they worth the $$$$ it's subjective really.. they have stepped Down-leg boosters which to me is the best all around booster.. Thanks for Watching Joseph.. hope all is well your way
Andy
If you drill out the holes in the power valve it helps to deliver more fuel at top in
I used to be a holly man, but I read a book by Doug Rowe back in the seventies the guy who invented the q jet better known as the GM quadrajet and I got to tell you all the way up to 750 CFM, that's the best carburetor ever. It ain't pretty, it looks ugly sitting on a nice manifold but after reading that book and exactly how to tune these carburetors, and all the tricks you can do to them, hands down the most tunable carburetor I have ever worked on. If you can still find that book, the quadrajet by Doug Rowe, I strongly recommend you add it to your library because there's a lot of old cars out there that had these carburetors and in the day of muscle cars... you think about every car that came from GM that had these carburetors on it.
GTO, 442, VETTS, CAMARO, FIREBIRDS, CHEVELLE, ETC.
Defiantly an underrated carb when they are setup right. Raised a lot of eyebrows seeing one sitting on a Ford.
I tuned my 2 POS Holly Carbs with a SLEDGEHAMMER !!
I Smashed the $hit out of them.......
NO MORE cylinders being washed down w/fuel & NO MORE STUPID POWER VALVES
1 of my Happiest Days of my Life was Installing a Carter AFB Carb on my 340'Cuda.
The Carter gave BETTER drivability, ease of starting & Performance !!!!
To say I had a 3 years bad experience with Holly Carbs is an understatement
Love the video. It's got me thinking about the engine I'm putting together now. Mild gen 6 BBC with vortex heads so no exhaust crossover. I have both a spread bore and square bore rpm Dual plane intakes. I keep going back and forth on carbs. I have a quadrajet, 770 and 670 street avengers, 750 3310, and a old spread bore Holley all kicking around. I'm pretty familiar with Holley's and the tricks you talked about today except for the booster tuning. If I was going to go with say the 750 Holley what booster style do you think would be the best for my application? No intake heat, coldish climate, torque and mpg are more important than every last hp as it's going in a dually truck.