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#1 |
Registered User
![]() Join Date: Aug 2009
Location: Panama City, FL
Posts: 84
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Rochester Quadrajet ID issue
Hey guys ... my carb is spewing gas all over the place so I have decided to rebuild the ol' quadrajet.
I grabbed the stamp and then went online to ID my specific carb but something has confused me. Stamp says: 7046216 YD I understand: 70= Rochester 46= ??? 2= 49 state emission 1= chevy 6= auto tranny YD= ?? The questions: Everywhere I check 46 is not an option, it SHOULD stand for 1976, however this engine (and I assume carb) is off of a 1980 chevy pickup (PO swapped the ol inline 6 for the 350/350). Furthermore it seems that rochester went to the 170 prefix in '76 and I don't have a 170 prefix. Is this something anyone else has run into? What is the YD? Any help from the all knowing would be greatly appreciated! Czar Out!
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------------------------------- '71 GMC 1500 Longbed (Marilyn: PICS) '04 Toyota Tacoma (grocery getter) '03 Lexus ES 300 (Wife's) ------------------------------- '72 GMC Short Fleet (Sold - offer I couldn't refuse) |
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#2 |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: Rochester Quadrajet ID issue
Check the casting again? Got any pics of the carb?
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#3 |
Registered User
![]() Join Date: Aug 2009
Location: Panama City, FL
Posts: 84
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Re: Rochester Quadrajet ID issue
I guess I need to go back over to the barn and recheck that casting number - it just doesn't make sense.
![]() Pictures: http://picasaweb.google.com/tuszynsk...at88b9p7DFtgE#
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------------------------------- '71 GMC 1500 Longbed (Marilyn: PICS) '04 Toyota Tacoma (grocery getter) '03 Lexus ES 300 (Wife's) ------------------------------- '72 GMC Short Fleet (Sold - offer I couldn't refuse) Last edited by czarcaustic; 09-28-2009 at 01:55 PM. Reason: added pictures |
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#4 |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: Rochester Quadrajet ID issue
Just for fun, I'm going to say it's a 1971.
The choke is pre-74, and the idle mixture screws would have been plugged from the factory if it was 72 or newer. Not to say that someone couldn't have changed that... I also think the vent on the front of the carb was different in years 1970 and older. |
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#5 |
Registered User
Join Date: Jul 2000
Location: Auburn,Ca USA
Posts: 369
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Re: Rochester Quadrajet ID issue
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68 Chevy l/b, 4 whl disc in the foothills of No Calif |
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#6 |
Registered User
![]() Join Date: Sep 2001
Location: Fort Wayne, Indiana, USA
Posts: 1,887
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Re: Rochester Quadrajet ID issue
The last two characters on my Q-Jet carb stamp is IU (likely in the same place as your YD) and in the carb section of my build sheet is IU, therefore I assume this was the code used at the factory. I have never seen a breakdown of this 2-letter code.
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#7 |
Senior Member
![]() Join Date: Feb 2003
Location: Gold Canyon Arizona
Posts: 4,336
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Re: Rochester Quadrajet ID issue
mine is a IU as well. anyone know?
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1971 K5 CST Blazer 1965 Chevelle Malibu 283 (sadly sold) 1968 Camaro 327 1968 Honda mini-trail z50a #377 1966 uh 1-D Huey |
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