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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | On a Carter W-1, the brass screw with the blunt point is the mixture screw......out approximately 1 full turn front lightly seated. The other screw is the throttle positioner screw a.k.a. curb idle screw, and rotates the opening of the throttle plate. After the engine is up to normal operating temperature, adjust this screw to adjust engine idle RPM. Clockwise will increase RPM, counterclockwise will decrease RPM.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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