Technical Holley-edelbrock help

So I'm just digging into the car I purchased last yr wich is a 32 roadster don't know much about the engine at all person I bought it from has no idea anything about it wheel and deal type thing trades but anyways my ? Is I have a Holley carb on it now wich I've been told need to be rebuilt and was told to maybe switch to edelbrock for how much I drive the car and less up keep what's everyone thoughts I believe it's a 750 Holley now can anyone confirm I'm gonna attach a pick of the numbers I have found wish I knew more on the engine but I don't and I'm a newbie at this so learning as I go

 

3310 is a 780 cfm should be a good carb for the street and cruising around. Why would you think it need to be rebuilt if the car runs ok.

 

alumslot - Wrong............

An 83310-1 is a...750 !

Nicholas -
It's a pretty simple lookup, (Google is your friend !) -
https://documents.holley.com/techlibrary_carb_numerical_listing.pdf

Page 12

Mike

 

What's the engine? SBC? Mild idle?

 

Keep the holley it is a much better than a edelbrock.

 

Give us some more details on the engine (model, size, performance parts, etc), transmission, etc.. There is nothing inherently wrong with this carburetor - unless it is completely sized wrong and or worn out. If you were going to have it rebuilt, I recommend that it is sent to somebody who really knows these carbs . . . not your local guy "who says he has done a lot of them". But, who says the carb needs anything?

 

Edelbrock. Set it and forget it...

 

So for the engine I'm not sure of what has been done same with the engine all I know is I was told that carb had to be rebuilt or to get a edelbrock do to set and forget less messing with it honestly I thought it had a 600 cfm on it but now but what you guys have said it is a 780 to me seems like I should be getting better throttle response and better power than what I have been in the look for somone that is good in upstate ny meaning Saratoga area I have only pics to go by right now withought taking apart to find out exactly what I have and even then would need some help I know it has a turbo 350 trans with Brodix heads not sure if valve covers where just thrown on or if it more than that

 

That's what I have been told

 

I know it's a 350 but other than that not sure it idles ok little rough but not bad was just told was leaking the carb that's all I really know just getting into this to be honest gotta start somewhere

 

Runs rough in my opinion a little and just seems off also that is what I was told when I did bring it to someone to give it a Quick Look over when I first got it

 

Given that it has Brodix heads, my guess is that the rest of the engine is probably setup for some higher horsepower and hence the pretty-big carb. I have an 830 Holley on my 383 SBC - makes 520 HP with a hydraulic roller cam.

It probably idles rough because it has a performance cam in it. If somebody is putting those types of heads on a SBC, I'm sure they also put money into a high-performance cam.

What you really need to do is take it to somebody who really knows performance SBC engines - and not just think a magical "new carb" is going to do something for you. There may be nothing wrong with your setup . . . no way to tell. If it was mine, I'd try to find a performance shop that knows carbs and has a chassis dyno to do some real tuning with it. My guess is that you have a few $$$ in the car - might as well get it to run as it can.

How well does it run when you take it on the road?

 

Also, it looks like the vacuum line is disconnected from the distributor - is it just lying there and sucking air or plugged off or what? Normally you would want vacuum advance (assuming the timing is setup correctly).

 

Does it run pretty well when it is cold and then have issues once it gets hot?

 

Ya it is not connected I don't see anything laying anywhere that's my thoughts I gotta find somewhere local that does that kind of stuff near me

 

Ya when it warms up it hesitates a little but not bad

 

The rebuild isn't that difficult, if you have patience. This book is a big help.

 

Some specs for list# 83310-1. This would probably be a good place to start.
LIST # CFM STOCK JETTING POWER VALVE TYPE
83310-1 750 (F)72, (R)plate 134-131 6.5 4160

To confuse things a bit, there is also a list# 3310-1.
The very first version (without the "8" or the "-1") was used by Chevrolet on the 375hp/396 and was rated at 780cfm.
Current versions are 750cfm and have a manual choke.

 

Ok thanks sorry about that I appreciate it so I know for the next time

 

the hose that is hooked up goes down to the transmission looks like the other ports are blocked off

 

With the car running, spray some carb cleaner around the base of the carb. Might be a vacuum leak caused by a spreadbore intake manifold and squarebore carb mismatch.

 

Clean up ( bowls jets carb cleaner etc) on Holley is pretty simple. Lot of tune up issues could be leading to running rough.

Timing and vacuum advance not hooked up would be good places to start.

 

So guys, tell him which port he should hook an advance vacuum hose up to. This might be a $3 fix.

 

This guy is asking for help. He doesn't know if he needs ported or manifold vacuum...