Quadrajet adjustment mixture adjustment screws

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Shank

Full Access Member
Joined
Mar 19, 2015
Posts
52
Reaction score
26
Location
Michigan
First Name
Bob
Truck Year
1986
Truck Model
K-10
Engine Size
305
I need to adjust the mixture on my quadrajet. What bit do I need on my tool to fit the adjustment screws? TIA.
 

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,756
Reaction score
3,047
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
Double D mixture adjustment tool works on the original mixture screws, or many carburetor parts stores will sell you new mixture screws with a standard flat tip screw head.
 

Matt69olds

Full Access Member
Joined
Jan 8, 2018
Posts
2,836
Reaction score
4,680
Location
Central Indiana
First Name
Matt
Truck Year
81
Truck Model
GMC 1/2 ton
Engine Size
455 Olds
Or you can remove them and carefully cut a slot in them for a common flare blade screwdriver.

Use a couple of pieces of scrap wood to protect the threads and tip, clamp them in a vice, and use a small cutoff wheel or hacksaw.
 
  • Like
Reactions: WFO

Sad Sack

Supporting Member
Supporting Member
Joined
Sep 3, 2024
Posts
2,663
Reaction score
5,556
Location
Nebraska
First Name
Goober
Truck Year
1985
Truck Model
C15
Engine Size
305
Get spares.
 

Forum statistics

Threads
48,425
Posts
1,067,220
Members
42,817
Latest member
crowe-t
Top