Set & Tune Holley Carburetor Idle Mixture & Idle Speed
258,869
Published 2020-04-01
All Comments (21)
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For people who don’t have a older person or father in their life and has to learn everything on their own I truly appreciate people like this who take their time out of their day to show people like me how to do these types of things purchased a 84 olds cutlass with a 305 in it and holly double pumper 650cfm and learning about the things I own and in case one day I’ll need to tune it learning is always the way thanks man
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This is the most accurate video I've seen. It even shows to turn the mixture screws out an extra 1/2 turn which hardly anyone knows to do. Like he said, it allows a cushion in case of a little contamination in the idle circuit. If you don't adjust that way you will be re-adjusting it at a sooner date. Customers are happier if they don't have to see their mechanic as often.
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Thank you for the time and effort. Been struggling with my Holley for quite a while. Watched the video and made the adjustments yesterday and problem solved.
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Having trouble today with a brand new carburetor and engine rebuild, tomorrow I am going to go at it with some knowledge! Thank you so very much for this video! I’ve seen others that talk and skim over the other two mixture screws but I wasn’t aware that they were that important.
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I just subscribed to your channel. I have to say you explained that incredibly clearly! Not too many people know about the secondary idle screw under the carb! Adjusting that screw is key to tuning idle on a choppy low vacuum cam!
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Great video and easy to follow. I'll be following your procedure to adjust my 750 double pumper👍
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Best video on tuning so glad you made this video
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Best video I’ve seen for basics
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Another good basic adjustment video...thank you
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Bang on! did it, tuned great now
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Man, I never thought about opening my secondary plates to help out with the idle. I'm running a 1972 455H.O Pontiac with a nasty cam and a 850 holley dbl pumper. My idle adjustment screws are not very helpful at 1200 rpm idle. Thanks for the idea, heading out to the shop now. Subbed. 👍👍🏁🏁
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Big thanks from Australia!
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Excellent video. Simple and clear.
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Very usefull video! 👍
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Nice video thanks for posting! What about the factory preset for the secondary idle? I'm rebuilding a used carb and would like to take it back to super stock. It's a 4781-5 and has a 50cc secondary pump with a brownish cam. Do you know if that's also stock? In the video it looks like you may have a 50cc pump as well.
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You're the only video i've came across that talks about having a bigger/racing cam. i was wondering why mine never changed when adjusting i thought something was wrong with my new 950cfm race brawler, now i know & need to take my carb off and adjust the secondary screw on the bottom. I have to run around 1100/1200 rpm for my cam in my 427 big block. You gained a sub from me.
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All great info , only thing when people hear warm the car they think 10 min idle is good take it for 15 min drive the carb characteristics will be quite different then idling for few miniutes
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Nice info. Amazing how important the transfer slots are yet not talked about. Even in the Holley quick set up manual it states adjust your curb idle screw to suit your best idle. Mine was way off. I pulled secondaries adjustment screw and put and Allen key screw so I can adjust.
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Thank you for the video. I have the 4776-4 Holley. I recently purchased the vehicle. The carb has the 4 holes for the adjusting screws but it only has 2 screws. Did Holley make carbs with 4 holes and only two screws or did my 2 rear ones fall out. The car is running rich and closing both front screws does not shut the car off. Sorry I’m not asking for mechanical advice. I was just wondering if I’m missing two screws. Thank you
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Great video
