Allen head in secondary idle adjuster, 3310-1

Boxerhips · Mar 24, 2025

Has any removed the flat head for an Allen? Does it walk loose or do you have the use blue thread lock?

I have seen someone use a bolt/spring ( like primary side idle adjuster), is this better than the Allen?

Finally use Allen in stock direction or from top? It’s not easy to get to no matter how you install.

CorkyE · Mar 24, 2025

I took a small (freebie) screwdriver and bent the end 090°. I've heard of people using an allen head set screw, from the bottom, with no problems.

ilikeike · Mar 24, 2025

I know people have flipped that screw over, so you can get to it from the top a little easier.

Melmount · Mar 25, 2025

I think Holley makes a bracket for that. Different piece of linkage. Makes it like adjusting the front

TomcatSTL · Mar 25, 2025

My solution was to cut a slot in the Allen with my Dremel wheel. I can squeeze in a small flathead screwdriver, if need be.

68fbird · Mar 25, 2025

Is this what you are talking about? I used a nut to lock the socket head cap screw.

68fbird · Mar 25, 2025

Carb shown is a 4779-2 list number.

SY1 · Mar 25, 2025

I turned the linkage and set screw upside down on my crossram carbs. Wanted to be able to set the secondary idles without removing carbs, ( everything else on top of manifold to get the carbs off). Wanted to watch engine response while adjusting secondary idles with engine running. Had the run a tap through the set srew threads on baseplate because Holley didn't do a thorough job. I have never seen an allen head, all Holleys I have had were/are straight slot. No reason you couldn't use an allen head.

One of my modified Holley carb secondary screws turned upside down. I do use threadlocker after removing Holley's interference fit with the tap.

My 830 annular NASCAR carb still has the original.set up. Sraight slot set screw with a point on the end.

straight slot head on 830.

Boxerhips · Mar 25, 2025

68fbird said:
Is this what you are talking about? I used a nut to lock the socket head cap screw.

View attachment 339775

Yes this.

Boxerhips · Mar 25, 2025

If the secondary‘s were open too much, would that cause the throttle run on. But after you release the peddle? Making the throttle less “snappy”

TomcatSTL · Mar 25, 2025

Boxerhips said:
If the secondary‘s were open too much, would that cause the throttle run on. But after you release the peddle? Making the throttle less “snappy”

You are going to have a host of bad manners if the secondaries are not set properly. These will be related to idle or just off-idle performance.

Allen head in secondary idle adjuster, 3310-1

Boxerhips

CorkyE

ilikeike

Melmount

TomcatSTL

68fbird

68fbird

SY1

Boxerhips

Boxerhips

TomcatSTL

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