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Need help identifying Holley Carb
I have looked everywhere and I still can't fully identify the Holley carb in my 351C. Obviously is not the original one because the date code indicates 1993. Below the date code it says "6R 4585 B", but this has not helped with full ID. The air horn has "3350" and what it appears as a scratched set of numbers. From what I read thats the list number that should tell me what it is. So the question is, can someone identify it based on pictures and numbers? My guess would be a 4160 600cfm, but would like the experts opinions.
Also, why will that # be scratched? were they hiding something?

Thank you.

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Top number is a list number. try to read it, or take a close up so we can. Dual metering blocks would be a 4150 series.

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.

Sometimes they have the carburetor number stamped on the base, where the butterflies are mounted. This might require removal of the carburetor.

I looked at the scratched numbers with a loop and side lighting. I think the first digit appears like '8' and the last two '78' or '73', so probably '8XX78' or '8XX73'.

Could it be that they scratched the numbers because they may have changed the jets and springs so it is not longer matches the original specs?
Who knows why they may have done such? It is a vacuum secondary Holley 4150. To determine the flow, you could remove it and measure the bore sizes.

Does it have 4 corner idle adjustment?

I'd bet it is a 750 cause everyone knows you have to have a holley 750 to go fast

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
I'll bet all that carbon build-up from backfiring hasn't helped a bit. I'd probably just replace it with an Edelbrock 1406 and be done with it. Big Grin


[Image: mach1sig2.gif]
A quick google search of "holley list 3350" gets this:

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
I looked at that one last night and it looks very close, but never saw a mention of the "3350" in that page.
Within the Street Avenger class they have 8 different part numbers: 0-80570, 0-80670, 0-80770, 0-80870, 0-81570, 0-81670, 0-81770, & 0-81870. It could be that my last digit is a zero instead of 3 and 8.
Probably have to contact Holley to be certain.
The list number on the choke horn is what I ALWAYS use to ID a Holley carb, or at least know what it was born as (since components can be changed through its life).
Yep, I see no other reference to 3350 anywhere in the online catalog, and did notice that there weren't any other pertinent hits in the google search. I work with auto parts daily, and often find these "weak" listings or dead ends when researching fitments or applications.

Holley's list number chart is big. I wouldn't be surprised to learn that the 3350 has been superseded in their part numbering system, or something to that effect. Seeing the numbers physically eradicated above the 3350 on your carb is odd, but who knows what they have done at the factory.

Just from the external physical properties, I'd guess that yours is the 670. Just my opinion, though.
Another way to check is to verify your carb internals (jets and such) with what they list in the parts section here:

or here:

Hope this helps thumb

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
I think we are very close. If you look carefully at my first picture, on the secondary side by the base of the carburetor you see a carved "670" that appears hand written.
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