Q-jet pic of interest - Page 2 - Chevelle Tech
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post #16 of 18 (permalink) Old Oct 10th, 19, 9:46 PM
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Beth
 
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Re: Q-jet pic of interest

A really good 800 cfm q-jet to get your hands on is carb # 10785212 used on mid to late 1980's HD emissions 454's and motorhomes.
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I thought the 1980's q-jets were all electronically controlled ?

The most desirable would be the Edelbrock 1903, 1904, 1906 and especially the 850 cfm 1910.

Also the 1976-1978 M4M q-jets (on big blocks) were 800 cfm and the idle mixture screws were exposed.

The serial numbers- if you look on ebay - would be 17056*, 17057* and 17058*.

Here's a great article about Qjets that talks about the most desirable models:

https://cliffshighperformance.com/ar...y-and-design/4

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post #17 of 18 (permalink) Old Oct 11th, 19, 12:44 AM
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leo
 
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Re: Q-jet pic of interest

Quote:
Originally Posted by nashville beth View Post
A really good 800 cfm q-jet to get your hands on is carb # 10785212 used on mid to late 1980's HD emissions 454's and motorhomes.
-------
I thought the 1980's q-jets were all electronically controlled ?

The most desirable would be the Edelbrock 1903, 1904, 1906 and especially the 850 cfm 1910.

Also the 1976-1978 M4M q-jets (on big blocks) were 800 cfm and the idle mixture screws were exposed.

The serial numbers- if you look on ebay - would be 17056*, 17057* and 17058*.

Here's a great article about Qjets that talks about the most desirable models:

https://cliffshighperformance.com/ar...y-and-design/4

Beth, I think only on automobiles, the truck ones had some kind of temp compensator or something like that. OBD 1 carbs were electronic on GM cars!!

Leo Paugh
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post #18 of 18 (permalink) Old Oct 11th, 19, 12:04 PM
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Tom
 
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Re: Q-jet pic of interest

The Heavy Duty Emission trucks and motorhomes in the 1980's did not have any electronic stuff on the carburetor other than the electric choke. The electronic carbs were on 1981 and later autos and 1983 and later Light Duty Emission trucks with California Emissions. The early 1980's Federal Light Duty Emission trucks had the Electronic Spark Control (ESC) Distributors combined with a solenoid in the float bowl of the carb that when the engine temp went above 170* it would open and 1/2 of the fuel pushed by the accelerator pump was diverted back to the float bowl. If you unplugged the solenoid the accelerator pump acted like any other Q-Jet.
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