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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: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | If the throttle positioner screw, a.k.a. curb idle screw, is turned in too far; it effectively removes the idle circuit from the carburetor, and the engine idles on the main circuit. If this condition is true, then one can close the idle mixture control screw OR remove it and place it in one's pocket with very little effect.
Your description "We set the idle at rough 500 RPMs".
Does this mean you used a tachometer and set the idle at 500 RPM and the idle was rough, OR you set the idle by ear at roughly 500 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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