1965 396 3124 carb replacement - Corvette Forum

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1965 396 3124 carb replacement

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Old 08-22-2009, 04:19 PM   #1
rovers2000
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Default 1965 396 3124 carb replacement

I have a 1965 396 corvette with the wronge intake and carb. I am looking to go back to a stock 3866963 intake. The holley 4150 3124 carbs run $1000 for a 1965 rebuilt carb. What can i use for a replacement holley carb that would fit in as a stock replacement? Do I have to order anything special to get the stock fit, performance, and looks.
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Old 08-23-2009, 01:42 PM   #2
JohnZ
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The original 3124 (750CFM dual-feed model 4150) was unique in that it had a restrictor fitting in the main body on the driver's side for the PCV pipe from the grommet in the driver's side valve cover, and it had a hot-air choke fed from the pass. side exhaust manifold with a nipple just below the top of the air horn for the choke clean air tube. You won't find either of these features on any current or replacement Holleys.

However, you could use a Holley 770 Avenger as a replacement - it's a dual-feed 4150 so the original fuel line setup will bolt right up, but it has an electric choke instead of the hot-air setup. It doesn't have the provision for the PCV restrictor fitting, but you can set it up like the '66-'67 big-block, with a PCV grommet and valve in the existing hole in the driver's side valve cover, and the '66-'67 PCV hose from the valve to the large PCV port on the passenger side of the carb.

Don't know how the 770 comes jetted, but the 3124 had 70's in the primary and 76's in the secondary. Connect the electric choke to an ignition-switched 12-volt source and you're in business. The original throttle linkage and air cleaner will work fine.

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Old 08-23-2009, 09:02 PM   #3
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thank you very much
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Old 07-18-2010, 03:09 PM   #4
jfburrow
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Default 1965 396 3124 Carb Replacement

Holley list 9188 is a reissue of 3124. It is a direct replacement.
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Old 07-19-2010, 12:01 AM   #5
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Quote:
Originally Posted by JohnZ View Post
The original 3124 (750CFM dual-feed model 4150) was unique in that it had a restrictor fitting in the main body on the driver's side for the PCV pipe from the grommet in the driver's side valve cover, and it had a hot-air choke fed from the pass. side exhaust manifold with a nipple just below the top of the air horn for the choke clean air tube. You won't find either of these features on any current or replacement Holleys.

.......
John, wasn't the original 3124 a 780 scfm?

Rovers2000, I also have a 65 396. I put together a carb from three donor carbs. I ended up with all the right parts. Here are a couple pics of the configuration John talked about.

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Click the image to open in full size.

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Old 07-19-2010, 08:01 AM   #6
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an original list#3124 with the correct small inlet fuel bowls is almost impossible to find and very expensive.I know first hand as like most every one else mine was gone.I searched some 3+years before I found one
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Old 07-20-2010, 02:03 PM   #7
Larry N. Johnson
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Quote:
Originally Posted by FASTZ View Post
an original list#3124 with the correct small inlet fuel bowls is almost impossible to find and very expensive.I know first hand as like most every one else mine was gone.I searched some 3+years before I found one
I have one, Holley Square Bore stamped:
3868826-CS
List 3124
995

See Carb ID for details.
Click the image to open in full size.

Not sure i will use it. Thinking 425 HP crate engine to replace the lost 396.
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Old 07-20-2010, 06:42 PM   #8
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Larry, the date on you carb (995) indicates a service replacement unit of 1969 (1st 9) - September (2nd 9) - 5th week (the 5). The quickest way for me to tell that a 3124 carb may be period correct for 65 is by looking at the center body of the carb at the bottom for the body shape. Notice yours has a square flange (protrusion) and period correct carbs are rounded and follow the contour of the base. Here's a pic after Eric Jackson restored mine.
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Old 07-21-2010, 08:54 AM   #9
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So, jbalch, are you saying my little gem isn't a $1000 piece?
I was hoping to sell a few parts and pay for a new crate engine.
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Old 07-21-2010, 09:37 AM   #10
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Quote:
Originally Posted by Larry N. Johnson View Post
So, jbalch, are you saying my little gem isn't a $1000 piece?
I was hoping to sell a few parts and pay for a new crate engine.
There are always unprepared buyers and who knows...... IMHO, if you can find a period correct 3124 with correct bowls and metering blocks for less than $2500 you have done well (and that's IF you can find one).
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Old 07-21-2010, 09:43 AM   #11
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Quote:
Originally Posted by jbalch View Post
There are always unprepared buyers and who knows...... IMHO, if you can find a period correct 3124 with correct bowls and metering blocks for less than $2500 you have done well (and that's IF you can find one).
Well, maybe a "service replavement unit" would be ok for someone untill a dead ringer is found? Are we saying a correct "service replacement unit" would be dinged by NCRS?
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Old 07-21-2010, 09:48 AM   #12
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Quote:
Originally Posted by Larry N. Johnson View Post
Well, maybe a "service replavement unit" would be ok for someone untill a dead ringer is found? Are we saying a correct "service replacement unit" would be dinged by NCRS?
Yes, but not a lot.
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