How does it effect/increase performance?

Is it worth the effort? Not like there would be a huge amount anyways.

Car is not a daily driver, sees occasional use on weekends and the occasional drive to work.

likley can't measure the diff.

When I was younger, I used a chopsaw to cut off my choke.:D

To show my awesome customizing skills, I drove with the air cleaner off.:D

I would also open my hood every chance I had.:D

I also didn't notice any improvement.

Yes you will see an improvement if you do it right. Do it wrong and you have useless crap. If you really want to have a bad a$$ carb just buy a body with no choke horn and sell your old one.

Did you cut your choke off?

Did you cut your choke off?

I have not got around to doing it yet. I may just remove the choke door.

I cut one off a Holley I had many years ago and transformed a good running carb into something that never worked right again, never found out why.
in the trash it went. It had a bad bog I could never get rid of that wasnt there before I did it. :confused:

buy an HP. no choke horn to start with. mine works great.

I wouldn't do it unless it's a race car. If you really need to you can take the choke door out, but save the parts. I just sold an old 850 and you don't know how many people asked if I had the parts for the choke. If you can fit it a K&N stub stack will do the same job.

I wouldn't do it unless it's a race car. If you really need to you can take the choke door out, but save the parts. I just sold an old 850 and you don't know how many people asked if I had the parts for the choke. If you can fit it a K&N stub stack will do the same job.

I hear that advice a lot, but my 500hp motor with no choke and no vac advance runs better than the 400hp motor with a choke and vac advance did, even right after start up. it will idle on it's own almost immediately.

After carving the choke horn off mine it made a noticable difference. Off idle throttle response was better and it just seems to perform better overall. Since I live in the south not having a choke really isn't a problem, just pump the gas a couple of timesand fire it up. After a brief warm up it's good to go.:thumbsup:

I've milled many choke horns away from Holleys, and on engines with more than about 230 degrees (mouse) or 240 degrees (rat) @.050" it starts to show a difference, but the lobe profiles and intake manifold design matter.
A manifold with a large plenum area, such as a single plane, will be more responsive to the small increase in flow than a dual plane will with its comparatively smaller plenum area. Of course part of the package is a cam and cyl heads that can take advantage of the single plane design. Just putting a Victor Jr. on a stock motor and whacking the air horn will likely as not be a waste of time and parts, but that's obvious.

A modern asymmetrical lobe with its rapid opening rate will take advantage of the small increase in cfm more than a traditional lobe with gentle ramps. Add that to a modern single plane intake design, especially with good heads and tuned exhaust, and removing the choke starts to make sense.

It is very important just how and where the milling is done in order to achieve an increase in overall cfm through the primary venturis. It's not hard to figure, just takes some thinking time.
The best way these days, of course, is to just change entire main bodies. Not a lot of reason anymore to de-choke a carb casting. Better to put the body up on a shelf and save it for when you might want a choke someday.

***
One thing that does help, sometimes very noticeably and only costs a few bucks, is to install a K&N Stubstack. Under the right conditions, similar to outlined above, this little guy does make a noticeable difference, although with the K&N piece you can achieve a difference with a more mild combo.
Many people report an increase in fuel efficiency with the Stubstack.

Eric

i`ve milled off a lot of holley carb chokes over the years...they come off fast in my bridgeport with a fine tooth roughing cutter...20 bucks to do it for anybody on here !!:yes::cool:no hack saw job here !!

I think you get a benefit from milling the tower off if you run a drop-base aircleaner like I do where the lid isnt too far from the choke tower.