Changing to quadrajet

E

eugrides

Not-quite-so-new-guy
Mar 23, 2013
34
8
I have a 85 MC with a 305 it has headers with air pump and no oxygen sensor or catylic convertor runs rich all the time .I want to go with a quadrjet carb do I need to change dist too I don't know how computer works .does it need oxygen sensor. I want it simple Thanks
 
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Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
7,077
113
Queens, NY
You will need a non-computer Quadrajet as well as a non-computer HEI distribtor. You can eliminate all the rest of the CCC stuff. Try to get '78 or '79 or '80 305 units as they are set up as close as you can get to yours.
 
E

eugrides

Not-quite-so-new-guy
Mar 23, 2013
34
8
I have an older quadrajet going to buy a distributor Can I elimanate all those controls on thermostat housing What vacuum do I need
 
79 USA 1

79 USA 1

G-Body Guru
Sep 2, 2011
615
93
Cheektowaga, New York
I swapped a Q jet on to the 267 of the car in the avitar. Car has headers so I eliminated the EFE valve and thermal vacuum switch (On the thermostat housing) along with any of the vacuum circuits from this diagram that I no longer needed. Removed about 5 miles of unneeded vacuum line.


Carb 4bbl.gif
 
TURNA

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
11,009
113
Socialist NY
Whats on it now?
 
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pontiac guy

pontiac guy

Master Mechanic
Oct 28, 2016
338
63
Royse City, TX
Ditch the EGR as well.
 
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DoubleV

DoubleV

Royal Smart Person
Feb 25, 2011
2,143
83
Medina Ohio
May be easier to just install an O2 sensor and get it running with stock setup.
 
DoubleV

DoubleV

Royal Smart Person
Feb 25, 2011
2,143
83
Medina Ohio
Best advice; don't ditch a damn thing until you understand why it's there in the first place and how it works. Until you understand, leave it there.
 

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