Question about Ford F-150
As you know, you have one of two things going on. it is running too rich or too lean. Run it hard for 15 minutes pull the plugs and check for black, wet looking soot = rich. Brownish, whitish dry looking soot = lean. Be sure your vacuum advance on the carb is hooked up to the proper port. Check the full advance of the timing with a light to be sure you have proper advance during rev up. You want 22 degs. full advance. If you have a pull choke try to close the choke to see if that will level out the hi end. If that works you are running to rich. adjust as necessary to lean it out. Too big a carb can also be your problem. For the best carb to engine size double the cubic inch of you engine. If your engine is a 290 ci you max size carb should be approx 550 cfm, Now if you engine has a hi rpm cam profile you have to factor in needed cfm at hi rpm. Thats why such and engine for racing will not have good bottom end or low rpm power. Sounds like you have just the opposite going on. Which can still be caused by a over sized carb. Too much fuel not enough air or room in the engine to burn it.
Posted on Sep 04, 2010
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Posted on Jan 02, 2017
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