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let me start by saying i am sorry if this has been asked before, but i couldnt really find anything like this in the search :eek:. i installed a new out of the box edelbrock 600 cfm carb with a manual choke on a stock 305. with every other edelbrock that i had, i turned the mixture screw in until the motor started to die, then backed the screw out a turn and a half. do this for both sides and viola! its set. on this new one, i can screw both all the way in and it still idles. am i missing something. i had it idling smooth and even took it for a quick run. seems to be ok, but the screws dont do anything. :confused:
 

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let me start by saying i am sorry if this has been asked before, but i couldnt really find anything like this in the search :eek:. i installed a new out of the box edelbrock 600 cfm carb with a manual choke on a stock 305. with every other edelbrock that i had, i turned the mixture screw in until the motor started to die, then backed the screw out a turn and a half. do this for both sides and viola! its set. on this new one, i can screw both all the way in and it still idles. am i missing something. i had it idling smooth and even took it for a quick run. seems to be ok, but the screws dont do anything. :confused:
i didnt notice any differance with mine either. screw em in or out, it idles the same...
 

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maybe the throttle stop is set open far enough that it's not drawing through the idle circuit.Advance the timing so it idles faster close the throttle stop down to get the idle back then try adjusting the mixture screws.
 

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In order to do it correctly, hook up a vaccum gauge and "T" to the "constant vaccum" port and adjust the screws. Don't ball park because you are not getting the full potential from the carb. Do 1 side at a time till you get the maximum ammout of vaccum and then do the other side.


Dan
 
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