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Spread-Bore Carbutetor Performance Upgrade Options

Holley offers various options to replace your square-bore (Quadrajet) carburetor for a Holley spread-bore carburetor. You can also perform a spread-bore to square-bore swap.


 


More Videos...


Tuning the 355 SBC Rebuilt the Holley 650 Spreadbore Carb
Tuning the 355 SBC Rebuilt the Holley 650 Spreadbore Carb





Installing A Manual Or Electric Choke On A Holley Carburetor
Installing an electric or manual choke can make engine start ups easier on your muscle car. These steps show how to install and adjust both types of chokes on just about any type of vehicle.





Holley 4150 Street HP carb rebuild- Tear- Down-Part 1/3
here is a video i made when I rebuilt my Holley 4150 Street HP carburetor that I purchased at a swap meet. It turns out it was in very clean condition and would not have needed rebuilding but I wanted to make sure it was clean inside. It was a good experience doing the rebuild. It's always good to learn something new. I am not a pro and this is my first Carb teardown so those folks that feel compelled to say what is wrong with what they see, please don't bother. Remember what your Mom said, "if you can't say something nice..."





Fuel Line Connection
Footage taken from the Holley Carburetor Installation & Tuning DVD





Attaching custom or specialized throttle linkage to a Holley carb
Check out these tips on attaching throttle linkage to a Holley carb on custom or unique applications. Holley offers a variety of linkage adapters and brackets that can make it easy.





How To Adjust The Accelerator Pump On Holley Carburetors
How-to adjust the accelerator pump on Holley carburetors to avoid stumbling and hesitation upon acceleration. Tips include: How to check for the clearance between the accelerator pump diaphragm arm & operating lever; how-to select the correct accelerator pump nozzle size, and accelerator pump cam selection and installation. Additional information can be found on Holley's website: http://forums.holley.com/entry.php?428-How-To-Cure-Carburetor-Stumble





How And When To Change The Jets On A Holley Carb
Holley explains how the main jets on a four-barrel carburetor operate. They also give instructions on changing the jets for increased performance. The video explains the various jet sizes, and how they affect engine performance.





Holley Shop Truck Tour
Host of Chuck's Garage Chuck Hanson talks with Holley President and CEO Tom Tomlinson about our 67 Chevrolet Shop Truck





How To Replace Your Engine's Intake For Using A Holley 4bbl Carb
Which intake you should use when using a Holley four-barrel carburetor. Matching the intake to the carburetor is key when upgrading to a Holley carburetor. This videos shows you the various options.





How To Install A Square-Bore Carburetor & Intake To Your Engine
Basic steps to replace your old carburetor and intake manifold with a Holley square -bore and performance Weiand intake manifold.





How To Install A Holley Carburetor
How to install a Holley carburetor onto a new intake manifold. This video offers tips such as the proper carburetor mount bolt torque specs, and air cleaner clearance.





Holley Carburetor Performance Tune - Summit Racing Quick Flicks
Norm covers all of the tips to get the most out of your Holley Performance Carburetor. He covers how to tune your Holley Carb for high horsepower and racing applications. He even goes over advanced power valve and jet tuning for the Holley Carburetor. http://www.summitracing.com/redirect?banner=SocialYT4536





Holley Carburetor Free Horsepower Tuning QUICKTIP
When opening the secondaries to adjust idle on a holley double pumper carburetor , you may ecounter this issue .. Secondaries progressive link , slip link adjustment .. Carter .. Edelbrock .. Barry gr





How To Adjust Fuel And Float Level On Holley Carbs
Holley demonstrates how to properly adjust the fuel level and the float on Holley four-barrel carburetors.





How Motorcycle Carburetors work and how to tune and clean them
Here's a link to the kind of carb cleaner I like best (it IS the best) http://www.amazon.com/gp/product/B002ERT666/ref=as_li_qf_sp_asin_il_tl?ie=U TF8&camp=1789&creative=9325&creativeASIN=B002ERT666&linkCode=as2&tag=httpww wyou00f-20 hey... awesome video..nicely explained ! just one question. Please do tel me wts AIR NEEDLE and LOW JET used for again. ? i mean how and what do they work? thanx :) Reply · The air needle is like a transitional restriction to increase vacuum pressure and tapered to prime the main jet flow gradually to ramp up fuel flow from the idle/low circuit to the main circuit. Think of the circuits like gears or stairs. The needle covers transition between 3rd gear to about 5th gear on a six speed. It overlaps basically. Fuel is getting by it from the idle/low- on through to where it's completely out of the way of the main jet and the main jet fuel flow is roaring like the straw/compressor example. Without the needle the carb would work, but not as smoothly through middle throttle (where most people ride and have the most fine input or throttle roll back and forth. The low jet is like second gear on a transmission. You can shift from 1st to 3rd, but again you risk stalling and it won't be as smooth. Also there isn't really the mechanical inertia to carry the process on like you have with a rolling vehicle with a flywheel on the engine and the wheels turning. The pistons still create vacuum every other time they go down, but air just doesn't have the punch that steel does when in motion. The circuits in a carburetor have to be there or you would have a limit on RPM range. An idle jet can't deliver enough fuel to really scream, and the main jet couldn't go slow and would be VERY hard to start because the engine would have to be spun up really fast. So you have usually four or five circuits (I want to say jets, but their physically different) that get air flow like stairs as the throttle opens. They are typically 1. Starting circuit (choke on) 2. Idle circuit 3. low jet 4. Jet Needle 5. Main jet. How Motorcycle Carburetors work and how to tune and clean them Check out my other channel here http://www.youtube.com/watch?v=1KKvwMaIotA





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