Jet Performance Quadrajet JET Performance anyone gotz?

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legend57

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San Jose, CA
First Name
Rob
Truck Year
1976
Truck Model
K20
Engine Size
400
When searching for a Qjet, I ended up going with National Carburetors #ND4528, based on my truck's specs (1976 K20, HD Emission, 400 engine). I installed it on my freshly rebuilt 400 and it started right up and idles like a dream. When I blip the throttle, the response is immediate, without any stumbling. I haven't driven it on the road, so I'm sure adjustments will be needed, but out of the box, I'm very happy so far.

Note, I installed a Carter inline electric fuel pump. The best part is when I turn the ignition "ON", the 400 fires IMMEDIATELY. It starts almost faster than I can release the key. I've used that Carter pump before and it was very reliable.
 

JD Miller

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Location
Goober Idaho
First Name
JD
Truck Year
1981
Truck Model
K20 silverado
Engine Size
350
When searching for a Qjet, I ended up going with National Carburetors #ND4528, based on my truck's specs (1976 K20, HD Emission, 400 engine). I installed it on my freshly rebuilt 400 and it started right up and idles like a dream. When I blip the throttle, the response is immediate, without any stumbling. I haven't driven it on the road, so I'm sure adjustments will be needed, but out of the box, I'm very happy so far.

Note, I installed a Carter inline electric fuel pump. The best part is when I turn the ignition "ON", the 400 fires IMMEDIATELY. It starts almost faster than I can release the key. I've used that Carter pump before and it was very reliable.
I was looking at National Carbs website several times. I was thinking of buying from them rather than Jet Performance. Less money and Might even be a better core and the inside parts not hacked up like Ive heard Jet does.

Most the core / junk-yard Q-jet Carbs for sale on ebay , for rebuilding, are corroded/rusted garbage, nothing salvageable
 

arborvitian

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Virginia
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Long-Winded Loser
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1974
Truck Model
C30
Engine Size
350
Redacted
 
Last edited:

JD Miller

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Joined
Sep 30, 2024
Posts
356
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648
Location
Goober Idaho
First Name
JD
Truck Year
1981
Truck Model
K20 silverado
Engine Size
350
arborvitian, there is a little swinging weight between the elec or heated choke housing and the carb on the throttle shaft that sounds like its sticking or the choke needs to be loosened and adjusted so it goes off sooner.

Maybe
 

arborvitian

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Joined
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Location
Virginia
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Long-Winded Loser
Truck Year
1974
Truck Model
C30
Engine Size
350
Redacted
 
Last edited:

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