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I have a 70 mustang I am trying to calibrate my edel carb I read an article here an it started out around 15" of vacuum mine started out around 9-10 after some adjusting of the idle mixture screws it raised to 11-12 the car has a mild cam edel 600cfm carb performerRPM intake 70 cast iron heads some head work done roller rockers MSD ignition shorty headers dual exhaust the car stumbles and smells rich I have changed the jets and metering rods did not seem to help I'm not sure how many sizes to go down before I cause another problem? LOOKING FOR ANY ADVICE THANKS
 

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This really depends on cam specs and altitude. I am at 4300' above sea level and with my cam 11" is the best I can get.
 
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