I have a friend who is EXTREMELY engine knowledgeable, has built cars professionaly, built chassis for Outlaw performance, and just someone I find to be really car savvy. My question is, he ALWAYS drills two .060 holes in the throttle plate/butterfly valves (the ones in the bottom of the carb), one on each, on the outer area of the plate. He claims that you cannot adjust the air flow on an Edelbrock 750 cfm at idle, just fuel and mixture rods. I hesitate to take a drill to a brand new carb, but it does run rich at idle and has a slight bog when you hit it off the line. He swears by this trick, and as I stated, always does it to these carbs before putting them on a BB motor. Any thoughts?????

Brian,
That "trick" is sometimes needed on competition engines. But...depending on your combination, you should be able to get your carb working properly without drilling holes. Without knowing your engine, its hard to say what the problem could be. You might need to get the Edelbrock tuning kit with different metering rods etc to fix it. I dont know if Edelbrocks web site has any good tuning procedures...might be worth a look. Drilling holes and other modifications should be a last resort type of thing.

Brian.
I don't pretend to be an expert on carbs, Eb or Holley, nor do I stay at Holiday Inn Express! BUT, I think that if the carb needed holes in the butterflies to adjust it, they would put them there. I could never figure out why folks will do things like that to a perfectly good piece of equipment. Edelbrocks site has a downloadable tuning manual.

http://www.martelbros.com/cgi-bin/store/ws400CS.cgi?store=EDE&cart_id=1030721025324747&page=edelbrock/eps_intro.html

Buy a kit with the various rods and springs and jets, and tune it the way they tell you to. I have no doubt that your friend can tune a carb with those holes in it, but don't start out with that step.
I am sure you will hear from others, most with more expertise than I.
JMHO
John