1986 gmc sierra carburetor

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K5steve87

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Nov 4, 2021
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Location
Illinois
First Name
Steve
Truck Year
1986
Truck Model
C10
Engine Size
305
I have a 1986 gmc sierra 1500 with a 305 in it. Having trouble with running rich. The quadrajet on it is a 17085230. Is this the original carb? The 3 means Cadillac I think.
 

Bextreme04

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Oregon
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Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
I'm not sure how strict the quadrajet numbering gets in the later years. I'd be shocked if everything else, including year manufactured, matched the original engine application except for the division. I would bet that carb is the original for your engine. My truck has a 17080213 and is an original 1980 K25 with a 350/TH400/NP205. According to the "numbering guide" my truck should have an even number as the last digit since it is an automatic truck. This is the correct carburetor for a federal emissions M engine code truck though.

The GM instruction sheet that came with my quadrajet rebuild kit shows a 17085215, 226, 227, 230, and 231 as being original equipment carbs for a 305H engine in 85-86
 

Bextreme04

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Engine Size
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fast 99

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Engine Size
350
Many other GM brands the fuel inlet was out the front. Trucks are on the right side so I doubt it is Caddy. Rich is a common Q jet issue, rebuild it.
 

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