'66 Holley Carb Number

[William G.]

Greetings,
This is my first post as I recently joined NCRS, again. Formerly owned a '68 and many years ago (early '70s) I had a '66 coupe. Decided I wanted a C2 again and recently bought another '66 coupe. Question on carb number. Recently I've seen offered for sale a few carbs with the Holley number 3367. I'm waiting for my car to be delived but believe my carb to carry no. 3367--I couldn't see an A on the front of the air horn when I went to inspect this car. The NCRS experts (you guys) say the number should be 3367A. So what is a 3367? A service replacement or a carb from a Camaro/Chevelle or what? Logic might suggest that 3367 is the original carb and 3367A a factory (warranty) replacement--but we know that is not true. Does a 3367 receive the full deduction when judging? This is a Bowtie award car and so most of the numbers match. I know the engine, transmission, rear end, radiator, expansion tank, alternator and likely a few others are original. Its a shame the carb was swapped, but after 44 years I'm lucky (I think) that it is a 3367. Thanks for any help.

Bill

[Rob M.]

Re: '66 Holley Carb Number

Greetings,
This is my first post as I recently joined NCRS, again. Formerly owned a '68 and many years ago (early '70s) I had a '66 coupe. Decided I wanted a C2 again and recently bought another '66 coupe. Question on carb number. Recently I've seen offered for sale a few carbs with the Holley number 3367. I'm waiting for my car to be delived but believe my carb to carry no. 3367--I couldn't see an A on the front of the air horn when I went to inspect this car. The NCRS experts (you guys) say the number should be 3367A. So what is a 3367? A service replacement or a carb from a Camaro/Chevelle or what? Logic might suggest that 3367 is the original carb and 3367A a factory (warranty) replacement--but we know that is not true. Does a 3367 receive the full deduction when judging? This is a Bowtie award car and so most of the numbers match. I know the engine, transmission, rear end, radiator, expansion tank, alternator and likely a few others are original. Its a shame the carb was swapped, but after 44 years I'm lucky (I think) that it is a 3367. Thanks for any help.

Bill

Hi Bill,

I believe the carb should have a 7 digit GM number and then the Holley list # of 3367 and then finally the date stamping. There shouldn't be a prefix or suffix on the stamping. From what you've posted, it sounds like the carb could be the original too. Congrats on the new ride!

[William G.]

Re: '66 Holley Carb Number

Thanks for the reply Rob. My 1953 to 1972 NCRS Specifications Guide says the List number should be 3367A. The "List Number" is the Holley number. I'm not able (yet) to double check the Chevrolet number nor the date code. I could (should) have checked those numbers closer when I had the car in "my hands" but had trouble reading the numbers and therefore didn't spend a lot of time with it once I noted that the A was missing from the Holley (List) number. Also Mike Antonick's book says the number should be 3367A, so unless both sources have had cause to revise their thinking I'm assuming the worst. My (limited) mental acuity suggests that possibly the first batch of carbs Holley shipped to Chevrolet the engineering staff had concerns about and those carbs were 3367. Holley made a requested change (and thus the A) but refused to take the first batch back and then Chevrolet said "what the hell" and used those "left over" carbs on warranty claims later. But.......I'm waiting until others chime in and until I can get another look at the car. Hopefully the shipper will deliver in two weeks. The funny (kinda) thing is that the carbs I've seen for sale (maybe three) are all 3367 numbered units. One would think the 3367A would be more common.
Bill

[Rob M.]

Re: '66 Holley Carb Number

Bill,

I'm no expert, but according to the new NCRS Technical Information Manual and Judging Guide, the Holley prefix "R" and suffix "A" are NOT stamped into the air horn stamping. FWIW, my 3367 doesn't have an "A" as part of the list number stamped on the air horn (it's dated April '66).

We'll see what others have to say, but I hope your carb is original and you won't have to buy one

[Jim S.]

Re: '66 Holley Carb Number

William ,

Rob is correct. While the A is part of the Part Number, it was not stamped into the Air Horn.

Here is a pic of my 66 for help in identifing yours.

JIm

[Jim S.]

Re: '66 Holley Carb Number

[Michael M.]

Re: '66 Holley Carb Number

Jim can you post some side and rear photos of your April dated 3367 Holley Carb?

[Jim S.]

Re: '66 Holley Carb Number

Jim can you post some side and rear photos of your April dated 3367 Holley Carb?

It's a 1st week in March (3-1)

[James B.]

Re: '66 Holley Carb Number

Stampings and appearance on my 66 carb are the same as Jim Schwering except my date is 5B2 or 1965 Dec. 2nd week

[Chester K.]

Re: '66 Holley Carb Number

Stampings and appearance on my 66 carb are the same as Jim Schwering except my date is 5B2 or 1965 Dec. 2nd week

Hello James, looking for a 3367 carb myself, date coded 57x or 58x or 59x, for my early 66 coupe,....know of any sources.??..Thanks Chet

[Ronald L.]

Re: '66 Holley Carb Number

Keep your eyes peeled for those Chicago and LA re stamps or, "not restamps because they were not stamped to begin with"

[David L.]

Re: '66 Holley Carb Number

It's a 1st week in March (3-1)

Jim,

Does your 3367 carb dated "631" have a double boss with a single tube for the vacuum line or does it have a single boss with a single tube?
I have a 3367 carb dated "613" (1966, Jan., 3rd week) with a metering block stamped "4743" (which is correct), and a base stamped "3367" with a double boss with a single tube (see photo below of base, front right corner of base when installed in a car). The casting numbers on the base is "12 R325?" and "3B". I can't read the digit after the number "5" since it is literally in the corner. I believe that my base may be a service base but I am not really sure.

Dave

[Jim S.]

Re: '66 Holley Carb Number

Dave,

Mine has the single boss.

Now is that right or wrong ? I have no idea !

All I can say is , I sent the carb that was on the car to Jerry Luck for a total restoration , and that is how I got it back .I have no idea if the base was original or not when I sent it .Nor do I know if he changed the base or not , or if he even took that into consideration . I hope it is correct, because if it is not, I am not changing it !

Jim

[David L.]

Re: '66 Holley Carb Number

Jim,

Thanks for responding. I'm 99.999999999999% sure that the 3367 carb with the single boss w/single tube on the base is correct. Does your carb have a "3367" stamping on the front driver's side corner like mine? My 3367 base with the double boss with single tube may or may not be correct for factory installed 3367 carbs. As far as I know all the service 3367 carbs have the double boss with single tube. It's possible that there were 2 vendors that supplied the bases to Holley. Hopefully I will find out some day.

Dave

[Jim S.]

Re: '66 Holley Carb Number

Dave ,

I can't tell you about the 3367 on the base plate , as it is now on the engine . I hope you are correct about the single boss .Untill this thread came up, I have never even considered it !



Jim