Thinking of an air-fuel meter to tune carb - any experience?

[DanEC]

Originally Posted by lippy

(1) Runs on after stopping sometimes.

Sometimes run on can simply be brought on by a high idle. What are you idling at?

Also, since I understand this engine to be pretty stout - are you familiar with the issue of where the throttle blade should sit at idle with respect to the idle slots in the bore? If the trottle blade rests at the upper part or above the idle fuel slots at idle, you lose tuning control of your idle fuel mixture and consequently tend to open the throttle up more with the idle screw to keep it running. If your idle is not responsive to adjustments in the idle screws this could be a part of the problem. When shutting the engine off, fuel can continue to be pulled from the idle slots and promote run on until the engine comes to a complete stop. On most Holley's it's pretty easy to compensate for because there is a set screw on the secondary throttle blades. The secondary throttle blades can be opened slightly to allow more air through them at idle - allowing the main idle adjustment to be backed off and the primary throttle blade to rest in the center of the idle slots where it needs to be. Actually I would anticipate Brent would check this when breaking in and dynoing the engine but if you have set the idle up a little higher in the car, it may have gotten outside where it needs to be.

Sorry if I'm telling you a bunch of stuff you have already looked at or considered.