Correct Holley 3367 Secondary Fuel Bowl

[Ralph J.]

I have a 1966 327/300hp (late '65 build), and I'm trying to determine the correct secondary fuel bowl for my 3367 Holley with date code 5 9 1. Should it be with or without the volcano? Mine currently does not have the volcano but I'm not sure that is correct.

Thanks,
Ralph

[Gary B.]

Ralph,

Are you talking about the air vent on the front bowl, as shown on this 3367?

Gary

[Ralph J.]

I'm referring to the rear float bowl with the word Holley on it. Attached is a picture of the rear of my carburetor.
Ralph

[Gary B.]

Ralph,

Search as I might, I can’t find what the “volcano” is that you’re talking about. Can you provide a description or a photo.

Gary

[Ralph J.]

Gary,
I'm sorry I guess I should have been a little more specific. Attached is a picture of a secondary fuel bowl with the round hole next to the word Holley. I've heard it referred to as the volcano. I just can't determine if it should be on my carb or not.
Ralph

[Ralph J.]

I was told my rear bowl was missing the circular hole to the left of the word "Holley" as in the attached picture of just the bowl with the #3 label on it. I'm just having trouble verifying whether or not it should be on a Sept 1965 dated carburetor. My car is a 1966 327/300hp built in approximately Oct 1965.

[Timothy B.]

Ralph, I am thinking yes your carburetor should look like the pic with #3. The later replacement bowls look like your existing secondary bowl.

[Ralph J.]

I'm thinking that it should have it as well but I need to confirm it before i make any changes.
Thank you all for your input and help.
Ralph

[Robert P.]

my oct 8th built 66 required that bowl in picture 3 , was pointed out at the nationals last year at Hampton roads
Bob

[Gary B.]

I think the question about the casting features on the rear bowl is a little more complicated than what has been described so far. It turns out there are three different rear fuel bowls: 1) a bowl with no “volcano” on the bottom surface and no “circle” casting to the left of the “HOLLEY”; 2) a bowl with the volcano on the bottom, but no circle casting on the rear surface; and 3) a bowl with both the volcano and the circle casting. The attached images show the three possibilities. All three of these bowls have the same basic casting number in the inside: 34R 2640-B.

IMG_8436.jpg

IMG_8433.jpg

IMG_8435.jpg

Some people have said the judges look for the volcano on the bottom, and some people have said the judges look for the circle casting on the rearward facing surface. My question is, do the judges who look the volcano on the bottom also look for the circle casting to the left of HOLLEY? Or do judges just want to see the volcano on the bottom, but no circle casting on the back surface?

Can anyone provide more clarity about these questions?

Thanks,

Gary

[Ralph J.]

This is getting a little more complicated than I thought. I've reached out to some other sources and will update this when I get an answer.

Thanks,
Ralph

[Gary B.]

Ralph,

There are several threads in the archives that mention the circle/volcano casting features on the rear bowl. Evidently, those rear bowl features are relevant to multiple carb listings numbers from the 64-67 time frame. Here are two threads that mention the rear bowl:

https://www.forums.ncrs.org/forum/te...-1#post1178407

https://www.forums.ncrs.org/forum/te...elp#post957412

Another tidbit of info comes from the 1965 JG. It has two comments about the rear bowl circle/volcano castings.

“The rear float bowl has two circular volcanoes, one on the rear side and one on the underside. [ M 6-18 ]”

“Judging Guidance: bowls without these castings should be considered later production and warrant an appropriate deduction

That ‘65 JG text makes it very clear about what judges should look for on ‘65s.

Note that photo “M 6-18” in the ‘65 JG shows a bowl like the 3rd photo in my post from yesterday, showing both the circle to the left of HOLLEY, and the volcano on the bottom. Unfortunately, the ‘65 JG does not indicate what time frame “later production” refers to. But it certainly suggests the circle/volcano casting features disappeared after some unknown time point. Abut when? And did both the circle and the volcano disappear at the same time?

Unfortunately, the ‘66 JG is completely silent about the rear bowl, so it’s not particularly helpful in figuring out this question.

Gary

[David H.]

... the ‘65 JG does not indicate what time frame “later production” refers to. But it certainly suggests the circle/volcano casting features disappeared after some unknown time point. Abut when? And did both the circle and the volcano disappear at the same time?

Unfortunately, the ‘66 JG is completely silent about the rear bowl, so it’s not particularly helpful in figuring out this question.
Gary

Gary

Possible that 66 is silent, given nothing there to judge?

Dave

[Gary B.]

Dave,

A good theory, but it is counter to the experience of several people who have their ‘66 L79s judged at recent Nationals and received deductions for the lack of one/both the circle/volcano on the rear bowl.

Gary

[Gary B.]

From an eBay auction I saw today, it appears there is a 4th version of the rear bowl with the 34R-2460B casting number. This once with a raised disc to the left of HOLLEY and no volcano on the bottom.

Gary