600 Holley vent tube question

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JDMopar

JDMopar

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I have a 600 Holley that I am considering using on my 273 after it's built, and I noticed something odd about the vent tube for the front bowl the other day. I noticed the tube looked like it had been cut off even with the choke horn, and it was shorter than any Holley vent tube I had ever seen. I figured I'd just fix it when I put a kit in it. Then, today I was looking at an ad that @Brooks James has up for Holley 600's, and noticed one of his carbs has the exact same vent tube. The other 600 in his pic has one that sticks up farther. Does it make any difference? If it won't cause any problems when the front float is set right, I'll just leave it alone, and I don't have enough experience with Holley's to know if it's even replaceable. Thanks.

Holley 600 carbs.jpg
 
Holley makes/sells long and short tubes for their carbs....that said, I don't know why some come with long tubes and others with short tubes. I also know that sometimes, depending on carb issues, people install the long tube even though the carb came with a short tube, helps with gas escaping under hard acceleration/stopping??
 
I just went out to the garage and looked at mine again. Aren’t there supposed to be tubes down in these openings? This carb was in a box of crap that was in my 65 Barracuda when I drug it out of GA.
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Somebody probably removed them to use on another carb!! They come out pretty easy.
 
:thankyou: Kim, Treblig, and Sssssssssnake! I gotta buy a kit to build it, a jet kit, blow proof power valve, and a few secondary diaphragms....so I'll buy the tubes too.

:thumbsup:
 
It almost looks to me like part of the airhorn has been machined off........
 
Those tubes pull right out, removed a few to ship in a box that was 1/2" too short. Marine carbs have that tube shaped like a bridge to tie both tubes together and drain back into the venturis. They are shaped like that to allow the direction of intake flow to flow across the chisel tip and cause a slight vacuum to pull vapor out the bowls, like the old downdraft tubes of the slants and old Y block Fords
 
You should have some amount of tube in there, otherwise fuel can slosh into the carb during braking/accelerating.
 
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