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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...


Attaching Early GM Throttle Linkage To Holley Carbs
There are various types of throttle linkages on early GM cars that attach differently to a Holley carburetor. Here are some tips to attach a variety of GM model throttle cables with different transmission applications.





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.





4165 & 4175 Carburetors
Footage taken from the Holley Carburetor Installation & Tuning DVD





Vacuum Lines Connection
Footage taken from Holley Carburetor Installation & Tuning DVD





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





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.





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.





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.





Holley Carb Troubleshooting and Rebuild - Things to Check!
Did some more troubleshooting on the carb. Found a few major issues. 1. The primary float bowl float was not adjusted correctly and was not shutting off the fuel. The tab on the float was bent down allowing the float to travel all the way to the top of the bowl without seating the needle. This allowed fuel to continually flow into the carb and richen it! 2. The power valve was the wrong size. According to Holley, the valve should be 1/2 the measurement of vacuum at idle in drive. According to my vacuum measurements, the power valve installed was opening too soon and dumping raw fuel in the engine when it was not ready for it, again richening the mixture! 3. The idle mixture screws were not set correctly. They were at 2-1/4 turns out. That is too rich for this particular engine setup. Using a vacuum gauge, I adjusted the idle mixture for maximum vacuum at idle. In my case, that was 1-1/2 turns out which is also the recommended Holley starting point. 4. My vacuum advance was not connected to the right port. It was connected to manifold vacuum instead of ported vacuum off the carb. This caused the timing to always be advanced at idle and then retarded under load as manifold vacuum drops under load! Totally backwards! Ported vacuum on a Holley can be found above the idle mixture screw on the passenger side of the carb at the metering block. I bought this carb about 10 years ago as a "store return". I didn't do much to it then, assuming it was fine . I just bolted it on and drove the car, seemed fine then. I realize now that the temporary owner messed with the float and bent the tab too far and he also changed the power valve. I am checking online to see what the stock main jets should be as he might have changed those too! Word to the wise, never take anyone's word for it that a carb is "all set to go!" Each application is different depending on the vehicle and the amount that the engine is built. Use the proper tools like vacuum gauges and look up tables to adjust for the proper values for your application. There is no one size fits all! Final word about power valves. Holley has built in an anti-backfire check valve circuit in all Holley carbs since 93. Blowing out a power valve by backfire is nearly impossible. However, the diaphragm can get old, cracked, and brittle so it is best to pull it and examine it if you suspect it to be a problem. To test it, turn all idle screws in all the way while the engine running at idle. If the engine stalls, the power valve is working properly. (keep track of the number of turns so you can put them back where they were). I did complete rebuilding the carb and reinstalled it. I will have more video of making adjustments and test drives soon...Thanks!!





Accelerator Pump
Footage taken from Holley Carburetor Installation & Tuning DVD





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.





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





Carburetor vs Fuel Injection - Summit Racing 101
What is the difference between a carburetor and fuel injection? Listen as Dave guides you through 2 barrel carbs, spread bore carbs, race carbs and compares them to EFI. To check out Summit Racing's selection of carburetors, click here: http://www.summitracing.com/redirect?banner=SocialYT4540 For Fuel Injection EFI systems, click here: http://www.summitracing.com/redirect?banner=SocialYT4541





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





How To Check Throttle Linkage Is Working Properly
Holley offers tips on checking the throttle linkage on your four-barrel carburetor to ensure the throttle linkage is opening and closing the throttle blades properly.





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