1966 Holley 3367 carb need help

[Robert M.]

I am restoring my base engine 1966 corvette, back to it after a couple of years off due to illness. It has a 3367 holley but has the wrong date, 042 (April 2, 1970). The build date of the car is J17 (May 17, 1966).The car has been in storage since 1984. Got her running but carb needs a rebuild/ restore. Most other parts on the car are dated correct. Who has a good reputation for selling these carbs, one that I can get properly dated? I could rebuild the one I have, I imagine it was a service replacement but I'd rather find a correct one. Any help would be useful, Thanks in advance and i would just like to say this club is great, the knowlege here is unsurpassed. Bob Mazzetti.

[David L.]

Re: 1966 Holley 3367 carb need help

Bob,

Somewhere in my collection I have an original 3367 Holley carb but I believe it is dated sometime in Jan. or Feb. 1966 and, as best as I can remember, it could use a base (base pitted on the bottom). I would say it was much too early for a May 1966 car but I will dig it out in the next day or so just to see what I have.

Dave

[Robert M.]

Re: 1966 Holley 3367 carb need help

Thank you.

[David L.]

Re: 1966 Holley 3367 carb need help

Bob,

Surprisingly I was able to find the carb quite easily. The carb is stamped "3884505 DA", "LIST 3367", and "613" (1966, January 1st 3rd week). I believe that the base (which has some deep pitting in one area on the bottom surface) is not original. I traded an AFB carb for it back in the 1980's.

Enclosed a 4 photos.

Dave

[David L.]

Re: 1966 Holley 3367 carb need help

I removed the base ( 3 photos enclosed). The base has a "12 R325? 3B" casting number on the top surface of the base.

[Robert M.]

Re: 1966 Holley 3367 carb need help

Thanks David. I sent you a pm.

[Gerard F.]

Re: 1966 Holley 3367 carb need help

Bob,

How much do you want to spend for about 8 points on the date code?

If you are a perfectionist, consider spending a grand or more and get one with a perfect date code and fully restored.
There is one on ebay right now dated April, 66 for $500 but it needs restoration.

You could also get a brand new one that can be date stamped, but a knowlegeable judge could still tell the difference from the main body configuration: same deduct.

If you are looking to restore, take a look at the article in the Spring 2011 Restorer on a 3810. I'm just a hobbiest, but I think I've got more than a grand into that carb.
Email me directly if you want a copy of the article.

[David L.]

Re: 1966 Holley 3367 carb need help

I contacted my older brother ( a Ford man) who I consider to be an expert on Holley 4bb carbs and he told me to look for a stamped number near one of the corner "ears" as he has had several 3367 carbs in the last 30-40 years.

Apparently my base is original to the 3367 carb as after I cleaned off some of the corrosion I did find the "3367" stamping on the front left "ear" (see photo below). The accelerator control lever is broken which is what confused me. Apparently my 3367 carb (dated "613" or 3rd week Jan. 1966) was installed on a 1966 Corvette w/A.T. as indicated by the stud (also shown in the photo below), GM # 3904944, as shown in the 1966 AIM, UPC M35, sheet A8.

Dave

[Gerard F.]

Re: 1966 Holley 3367 carb need help

David,

Although the base in your photo is stamped correctly, the double boss for the vacuum port, is more consistent with a replacement. I could be all wet on this, as I am more familiar with 3810's.

Maybe it is just a different casting vendor, but I think the double boss came in later as a generic casting for use with other carburetors.

[David L.]

Re: 1966 Holley 3367 carb need help

David,

Although the base in your photo is stamped correctly, the double boss for the vacuum port, is more consistent with a replacement. I could be all wet on this, as I am more familiar with 3810's.

Maybe it is just a different casting vendor, but I think the double boss came in later as a generic casting for use with other carburetors.

Jerry,

I really do not know much about Holley 4bbl carbs. Based on the condition of the base it appears to be original. One of the 2 channels on the bottom side is really pitted. The base does have a double boss but only one has a vacuum tube. The top sections of the carb still have a fair olive drab coating. The Holley carb is one of the very few parts that I have not really researched in the past 33 years.

The links below show two factory installed 3367 carbs both dated 653 (3rd week May 1966). The "rebuilt" one has a single boss & tube and the "restored" one has a double boss w/one tube. Even though my base is stamped "3367" it might (or might not) be a service replacement.

Thanks for your comment, I will do more research. As usual, I learn something new every day.

Dave

http://www.ebay.com/itm/1966-Holley-Corvette-Holley-carburator-list-3367-orig-dated-653-fresh-rebuild-/230721869952?pt=Vintage_Car_Truck_Parts_Accessories&hash=item35b8185880&vxp=mtr

http://www.ebay.com/itm/1966-3367-653-DATED-HOLLEY-CORVETTE-RESTORED-/260469934230?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ca537c896&vxp=mtr

BTW, while surfing on the web (metering plate 4743) I came across your website entitled "MY ORIGINAL CARBURETOR?? HOLLEY CARBURETOR RESTORATION DO IT YOURSELF". Your 3810 base plate looks exactly like my 3367 base plate EXCEPT that my plate has the double bosses with a single tube. Based on this I tend to agree with you that the factory 3367 base plate probably came with the single boss.

Could you tell me what the casting number is on your 3810 base?

[Gerard F.]

Re: 1966 Holley 3367 carb need help

Dave,

I'm like you, I learn something new each day, and I like to explore details.

Another thing about original 66-67 Holleys that I'd like to find out about, is the circular boss which sticks out from the main body on the throttle side. It really serves no operational purpose.

All the replacements I've seen have this boss as well as some dated originals shown on ebay. The two 3367's referenced above have the boss, yet you see other dated originals, both 3367's and 3810's without the boss.
I have two original and one replacement 3810. The originals have no boss, the replacement has it. I also have a original 66 3139-1 (396 Chevelle carb), no boss. The 67 Service Manual shows a general picture of a 4160 carb, it has the boss.

So I'm scratching my head and hoping someone knows why we see two different main body castings on the same list numbered carb. I was thinking that the boss maybe has something to do with the casting method, and different vendors to Holley.

Any comments appreciated.

[David L.]

Re: 1966 Holley 3367 carb need help

Jerry,

I assume the circular boss on the main body that you are talking about is shown in my 2nd photo (of the 4 photos) posted yesterday, 09/25/2012, @ 8:08 PM.
The 3810 carb dated "763" in your website (noted previously) does not have the circular boss.

Another thing to learn today.

Dave

[Gerard F.]

Re: 1966 Holley 3367 carb need help

Dave,

Here's a picture of the casting and stamp on that 3810 in the restoration story:



12 R3253B Casting Note the 3810 is double stamped.

This base plate came off a previous restoration of a 3810 dated 751. On that project I put a replacement throttle plate and saved this one.
That's how I realized the difference in the vacuum bosses.

The 763 3810 in the article came with the wrong throttle plate assembly, so I used the one above on the 763 after bushing the primary shaft as shown in the article.

[Russ S.]

Re: 1966 Holley 3367 carb need help

Jerry,

I really do not know much about Holley 4bbl carbs. Based on the condition of the base it appears to be original. One of the 2 channels on the bottom side is really pitted. The base does have a double boss but only one has a vacuum tube. The top sections of the carb still have a fair olive drab coating. The Holley carb is one of the very few parts that I have not really researched in the past 33 years.

The links below show two factory installed 3367 carbs both dated 653 (3rd week May 1966). The "rebuilt" one has a single boss & tube and the "restored" one has a double boss w/one tube. Even though my base is stamped "3367" it might (or might not) be a service replacement.

Thanks for your comment, I will do more research. As usual, I learn something new every day.

Dave

http://www.ebay.com/itm/1966-Holley-Corvette-Holley-carburator-list-3367-orig-dated-653-fresh-rebuild-/230721869952?pt=Vintage_Car_Truck_Parts_Accessories&hash=item35b8185880&vxp=mtr

http://www.ebay.com/itm/1966-3367-653-DATED-HOLLEY-CORVETTE-RESTORED-/260469934230?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ca537c896&vxp=mtr

BTW, while surfing on the web (metering plate 4743) I came across your website entitled "MY ORIGINAL CARBURETOR?? HOLLEY CARBURETOR RESTORATION DO IT YOURSELF". Your 3810 base plate looks exactly like my 3367 base plate EXCEPT that my plate has the double bosses with a single tube. Based on this I tend to agree with you that the factory 3367 base plate probably came with the single boss.

Could you tell me what the casting number is on your 3810 base?

The 66 TIMJG has a picture and states that original bases had two bosses and two functional tubes. I don't know if this is correct tho.

[David L.]

Re: 1966 Holley 3367 carb need help

The 66 TIMJG has a picture and states that original bases had two bosses and two functional tubes. I don't know if this is correct tho.

Russ,

I have very little faith in the judging guides. I rely on physical evidence from many sources as well as research using my vintage Chev. parts catalogs and other GM documentation. It's possible that the factory installed bases were made by two different vendors for Holley as mentioned by Jerry.

Dave