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Topic: 1977 C3 Rochester Carb

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1977 C3 Rochester Carb (1/9)
 11/29/21 9:52pm
Mark Laird
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Milford, DE - USA

Vette(s):
1977 C3 Auto Coupe Lt Blue/Dk Blue Prev. 1968 C3 convertible 4spd Red 1984 C4 Automatic Silver 2000 C5 Automatic Black


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I just bought a 1977 Automatic L48 . It currently has a Holly Spreadbore Carb thats atleast 23 years old. I want to put the original make carb that it came new with back on it. Can anyone tell me what exact Carburetor came with them back in 1977? I know it was a Rochester but could someone tell me the model number or part number?

Thanks for any help!

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Re: 1977 C3 Rochester Carb (2/9)
 11/29/21 10:51pm
NorskyLifetime Member
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I believe most C3s came with the Rochester Quadra-Jet carbs.  My '70 originally had one from the factory but a previous owner had replaced it with a Holley spread bore.  I'm sure someone else will have a better answer for you.



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Re: 1977 C3 Rochester Carb (3/9)
 11/29/21 11:03pm
73shark
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Try calling Cliff Ruggles at cliffshighperformance.com.  He literally wrote the book on Q-jets.



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Re: 1977 C3 Rochester Carb (4/9)
 11/29/21 11:06pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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'77 automatic with A/C should be a Quadrajet #1705204. If you look for one, the part number is located on the driver side rear of the carb. Depending on the manufacturer(some were made by Carter, most by Rochester), the number may or may not start with 170xxxx...some only have a 70xxx as the first numbers. The build date code is in that same spot.

 



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Re: 1977 C3 Rochester Carb (5/9)
 11/30/21 11:49am
manchestersharkLifetime Member
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Equinunk, PA - USA

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Greetings, I believe there is a number missing in the last post. The Rochester number for a 1977 auto with AC is 17057204. ALL Rochester numbers AFTER 1975, started with "1". 1975 and earlier started with "7". This should help in finding a correct unit. 



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Re: 1977 C3 Rochester Carb (6/9)
 11/30/21 12:36pm
manchestersharkLifetime Member
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Equinunk, PA - USA

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Greetings again.  As another factor for finding a correct unit, the "7" in the number, 5th digit, designates the year of the car in which the carburator was installed. The number that was missing is the year.



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Re: 1977 C3 Rochester Carb (7/9)
 11/30/21 12:56pm
Mark Laird
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Milford, DE - USA

Vette(s):
1977 C3 Auto Coupe Lt Blue/Dk Blue Prev. 1968 C3 convertible 4spd Red 1984 C4 Automatic Silver 2000 C5 Automatic Black


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Posts: 43

Thanks for all the helpful information!
Re: 1977 C3 Rochester Carb (8/9)
 11/30/21 1:29pm
manchestersharkLifetime Member
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Equinunk, PA - USA

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No Problem.  We're here to help. Together  Everyone Achieves More. 

 



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Re: 1977 C3 Rochester Carb (9/9)
 11/30/21 10:56pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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manchestershark said:

Greetings, I believe there is a number missing in the last post. The Rochester number for a 1977 auto with AC is 17057204. ALL Rochester numbers AFTER 1975, started with "1". 1975 and earlier started with "7". This should help in finding a correct unit. 


Good catch Mark!! Old man typo....🤓



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