What risks are involved / carb help

sam z

sam z

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Hey guys,
I may have an opportunity to pick up a Holley 750 vac secondary
carb for only $25.00. Always being budget minded, this appeals to me.

It's only $25 bucks, I realize that, but I don't want to buy a useless piece
of junk.

Question: If I look at this thing, what should I look for with a visual inspection
that would indicate if it was workable or not? Any help is appreciated.

I'm under the impression the bottom could be warped from being torqued
down too much but other than that I need any and all advice.

If I do get this thing the goal would be to disassemble, clean, reassemble, and
give to my tech to mount and get the car running right after the car is painted.
Basically taking on a project for the remainder of the winter. I should include that
I completely understand I need a carb kit for this.

Thanks in advance.
 
What did you find, Sam/ Is this a 3310? Assuming that there is an issue that prevents it from being used, that's still a lot of good carb parts to pick up for $25... :cents:

As you noted, take a straight edge (or something similar) to the base plate...

Is the choke horn milled off? Does it look monkeyed with? Pull the bowls and metering block(s) off and look for obvious signs that somebody took a drill to anything. Even if the main body or base plate is junk you can get replacements and put it together cheaper than a new carb in most cases... Metering blocks can be converted to easy jet change versions...

Check to make sure that none of the obvious, accessible threaded holes are stripped; main body, fuel bowl sights, mixture adjustment screws, etc. Just every day common sense stuff.

Offer him $20.... :D
 
Thanks Ray...
Is it that common that somebody would start drilling holes where they
don't belong? That's kind of stupid. Believable, but stupid.

I'm unsure of the carb number at the present time, guy is gonna check it
and get back to me. He has a number of carbs I guess.
 
sam z said:
Is it that common that somebody would start drilling holes where they
don't belong? That's kind of stupid. Believable, but stupid.
Click to expand...

Not necessarily where they don't belong, but people sometimes modify the main body & metering blocks when they modify/port a carburetor. Simply stated, you can enlarge a hole but you cannot (easily) take it back to its original size.
 
Make sure it is what he says it is. I have seen more than a few try and pass off small carbs as big ones. :cents:
 
Like Ray said a 3310 is a great carb to work with, I have one on my jeep and ist real easy to work with :thumbsup:
 
One other thought. A 3310 or 750 cfm will have 172 and 173 stamped on the butterflies. Some 650 Double pumpers have the same butterflies but can be converted to 750s with a 90 dollar Holley Hp center section.
 
Well...so far no good. Two of his three are only 600 cfm carbs. He is checking his 3rd now. He believes it's a 750. I'll
let you know.
 
If you are running a 383, that 650 might not be all that bad. Won't have the punch a 3310 will but for 25 bucks and a kit...
 
I have a 650 DP on my 383. I also have a 750 DP, but my car just dosent like that one. The same guy built both, so I doubt its built wrong. Plus, I've had it back to him several times. For some reason, the 650 just works great.

For $25 I doubt you could go that wrong.
 
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