1966 Holley 3367 carb need help

[David L.]

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.

Jerry,

It's interesting that the casting number ("12 R3253 B") on your 3810 base dated "751" with a single boss is very similar to the casting number ("12 R325? 3B") on my base with double bosses. My casting number rides up onto the second boss. It seems that someone was not paying attention when my base was cast.

Dave

[David L.]

Re: 1966 Holley 3367 carb need help

Jerry,

After doing a bit more cleaning I found a manufacture's name on my "3367" base with the double bosses. On the top of the passenger side rear "ear" there is a casting of a name (in cursive), "Empire" with the number "2" underneath (as shown in my photo highlighted in red). The use of a magnifying glass really helped. Could Empire Die Casting of Macedonia, Ohio be the manufacturer?

The main body of my 3367 carb dated "613" has a "P10" casting on the driver's side.

Dave

[David L.]

Re: 1966 Holley 3367 carb need help

Jerry,

Here is another minor detail.

Does your original 3810 carb have a rear fuel bowl with a "circle/plug" on it just to the left of the name "HOLLEY" as shown in the photo below of my 3367 carb and the 3367 carb dated "591" currently on Ebay? Another NCRS member noticed this in another thread about 3367 carbs.

Dave

http://www.ebay.com/itm/ORIGINAL-HOLLEY-CARBURETOR-1966-CHEVROLET-CORVETTE-3367-SBC-350HP-327-dated-591-/170866988932?pt=Motors_Car_Truck_Parts_Accessories&hash=item27c8775784&vxp=mtr

[John H.]

Re: 1966 Holley 3367 carb need help

Jerry,

Here is another minor detail.

Does your original 3810 carb have a rear fuel bowl with a "circle/plug" on it just to the left of the name "HOLLEY" as shown in the photo below of my 3367 carb and the 3367 carb dated "591" currently on Ebay? Another NCRS member noticed this in another thread about 3367 carbs.

Dave

http://www.ebay.com/itm/ORIGINAL-HOL...775784&vxp=mtr

David -

My original 3810 (dated 734) doesn't have that "circle/plug" feature on the secondary bowl.

[Gerard F.]

Re: 1966 Holley 3367 carb need help

Dave,

The 67 carbs (3810, 3814) had different fuel bowls than previous years(3367 and others). In 67, they went to the not externally adjustable float fuel bowls which I think do not have that circular boss/plug. All the 3810 bowls I have do not have it.

I think the "circle/plug" has something to do with the float adjustment. There should be another circle/plug on the underside of the bowl opposite the adjusting screw. I think there was a number of 65-66 Holley's with that same bowl with the circle/plugs. I have a 3139-1 that is identical.

Attached is a Holley part comparison chart I did some years ago, when I was looking for equivalent parts for my 3810:


As you will see in the chart, the 3810 and 3814 have different part numbers for the fuel bowls than the 3367 and other carbs listed. The 65-66 Chev carbs listed all share the same part numbers for the fuel bowls. This is also true of the pump operating lever which changed for the 67 carbs. The boss for the pump lever on previous carbs was cut off and replaced with a stud.

The throttle body (base plate), although of the same casting number, have a different part number for the throttle body and shaft assembly for each different carb, as the casting was particularly modified, and had a different linkage setup on the shaft.

I think you will see from the chart that a 3810 and 3367 are pretty close except for a few parts.

If the chart doesn't print out well, email me and I'll send a clearer copy.

[David L.]

Re: 1966 Holley 3367 carb need help

Jerry,

In an old Nov. 2005 thread entitled "66 Holley Carburetor Question", member # 44584 has a 3367 carb dated "613", the same date as my 3367 carb. The secondary bowl on his carb has a casting number "34R-2460-B". My 3367 carb has the casting number "34 R 2460B" as well as a vendor's logo (small "O" on a large "S" inside a "stretched' hexagon) followed with the number "3".

According to my research in my 1964, 1965, 1966, and 1967 Chevrolet parts catalogs the GM part numbers for the secondary bowls are as follows:
GM # 3867990 (Holley #34R-2541A), 64-65 Corvette w/SHP 327
GM # 3881426, 66 Corvette w/327
GM # 3912072, 67 Corvette w/Holley 4BC

As per Chevrolet Parts History:
3867990 to 3966914 in May 1969
3881426 to 3966915 in May 1969
3912072 to 3966913 in May 1969

My 1966 Corvair-Chevy II -Chevelle Parts Catalog lists GM # 3881426 for the 1966 Chevelle (396)(exc. A.I.R., H/Per.) with a description "Holley 34R-2779A".

I assume that the Holley casting number is not the same as the Holley part number.

Dave

[Timothy B.]

Re: 1966 Holley 3367 carb need help

David, Jerry,

I have that same bowl with the circle plug on the back and bottom and the same casting # David reported and this bowl came to me on a early used 3810 Holley dated August 1966. Now to really stir the pot, this bowl has a plug where the external float adjustment would be like what's typical on a 3810 and there is no brass plug on the side to check float level.

I can't say it's the original bowl to this early 3810 because the base plate was incorrect and from a big block carb with ported vacuum advance and larger throttle bore, but I can't say the bowl is not original either..

[Clem Z.]

Re: 1966 Holley 3367 carb need help

from holley.how you convert engineering numbers to corresponding sales numbers. 2R-298 = 1002-298, 38R-464 = 1038-464

[Gerard F.]

Re: 1966 Holley 3367 carb need help

Jerry,

In an old Nov. 2005 thread entitled "66 Holley Carburetor Question", member # 44584 has a 3367 carb dated "613", the same date as my 3367 carb. The secondary bowl on his carb has a casting number "34R-2460-B". My 3367 carb has the casting number "34 R 2460B" as well as a vendor's logo (small "O" on a large "S" inside a "stretched' hexagon) followed with the number "3".

According to my research in my 1964, 1965, 1966, and 1967 Chevrolet parts catalogs the GM part numbers for the secondary bowls are as follows:
GM # 3867990 (Holley #34R-2541A), 64-65 Corvette w/SHP 327
GM # 3881426, 66 Corvette w/327
GM # 3912072, 67 Corvette w/Holley 4BC

As per Chevrolet Parts History:
3867990 to 3966914 in May 1969
3881426 to 3966915 in May 1969
3912072 to 3966913 in May 1969

My 1966 Corvair-Chevy II -Chevelle Parts Catalog lists GM # 3881426 for the 1966 Chevelle (396)(exc. A.I.R., H/Per.) with a description "Holley 34R-2779A".

I assume that the Holley casting number is not the same as the Holley part number.

Dave

Dave,

You see the same casting numbers on various Holley parts and part numbers, and with different configurations. For instance, the 67 fuel bowls without the circle/plug has the same casting number as the 66 one with. I think this is also true of the main bodies with and without the circular boss on the side. Interesting that the 66 3367 base plate and 67 3810 base plate has the same number, although different in the configuration of the accellerator pump lever mounting.

I would guess that the base plates had the same casting, and then were machined to the particular list number and Holley part number. But the cast in bosses in the fuel bowls and the main body for the same casting number mystifies me.
The bosses, or circle/plug, seem to serve no operational purpose.

So I think maybe the bosses and circle/plugs have something to do with the casting or machining process and technique. Different vendors may have used different casting methods or machining techniques. Maybe the bosses fit into a fixture which held the part while it was being machined.

Maybe there is someone out there, more knowledgeable than us about the casting, machining and production process of these Holley carbs, who can solve this mystery.

[David L.]

Re: 1966 Holley 3367 carb need help

Jerry,

You are correct about Holley using the same casting number for different parts.

The NORS 3966918 fuel bowl currently on Ebay (see link below) listed for a 1966 Chevelle 327 w/SHP has a "34 R 2460-B" casting number. The vendor logo casting after the casting number is not the same as my 3367 fuel bowl. I guess Holley did use different vendors to make their castings.

My 1966 Corvair-Chevy II - Chevelle parts catalog (Jan. 1966) lists GM # 3877146 (Holley part # 34R-2779A in description) as the secondary fuel bowl for the 1966 Chevelle w/SHP.
GM # 3877146 was replaced with GM # 3966918 in May 1970.

Dave

http://www.ebay.com/itm/1966-Chevelle-327-Special-High-Performance-Holley-Fuel-Bowl-NOS-GM-3966918-/120930098842?pt=Vintage_Car_Truck_Parts_Accessories&hash=item1c27fede9a&vxp=mtr

[Ronald L.]

Re: 1966 Holley 3367 carb need help

David,
look at more bases, the 2 is the cavity number.

Do they all have Empire and a number?

Die casting molds did not last that long, so with volume back then, you could be looking at mold cavity variation more that different vendors.
So, before you go to different vendors just because its easy answer, how many base plates per year in a given configuration?

Same question for the float bowels, how many per year were made, do you see casting cavity on these?

[Harry L.]

Re: 1966 Holley 3367 carb need help

Russ

I have used Tom Zeeman in the past. he is an honest an surely talented man. His carb work is second to none. And he has a great inventory. He is located in Islip, NY
(631) 581-2009

Good Luck Harry 38533

[David T.]

Re: 1966 Holley 3367 carb need help

When you get it all sorted out and want to have it rebuilt and replated, send it to Carb Junkys in Atlanta. 866-961-2272. Ask for melissa. They did a wonderful job on mine.