Rich running new engine
You need to tune the idle circuit. On a Holley it's the power valve that would have to go to a lower number. On an Edelbrock you would put in a lighter step up spring. I'm sure Demon is very similar to the Holley. I would think 4.5 or 6.5 power valve would get you in the ballpark. Power valve should be 2 numbers lower than the vacuum reading at idle (in gear if auto)
Thanks Mickey, we will try it.
We figured out that the demon carb really is a demon to this fussy engine. 3 demons same problem, put on a new edelbrock carb, plugs cleared up & engine runs like a sweetheart now.
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7 months ago
We built a new engine .060 350 eagle rotating assemble with an edelbrock 2098 upperend assemble. Deamon 600 carb, new MSD ignition. We cannot get this engine to quit running rich. Tried 3 different carbs, hotter plugs & everything anyone could think of and get no change. When you start this engine the plugs immediatly turn black. We are totally lost on what to look for.