Originally Posted by Bilito
I called holley and they told me I have a 4180 600CFM carb and the adjusting screws are hidden under the front primary fuel bowl behind some caps. To get the caps off I have to remove the carb to dig em out.
Ford ordered the carb built that way, they felt the factory adjustment was good enough. The holly guy suggested I leave well enough alone and perhaps to run some carb cleaner thru there
EPA, not ford... almost all carbs in the whole 1980's until they were phased out for fuel injection where required to have capped or non user adjustable mixtures, unless it was a boat or off road engine.
holley built millions for gm, amc, ford. good thing is that they are easy to clean and repair and get the fuel mixture trimmed out and you should be golden.
not using ethanol.....not so easy.
reformulated gas is killing us in our weedeaters and lawn equipment