Put your fingers over the idle air bleeds while its trying to idle. If it picks up you need to put smaller air bleeds in the idle circuit. Alot of those carbs came with a little baggy and you use to have to put these restrictors on the air bleeds.

Dave

 

Yeah, Jesse, that's them. I discovered that the throttle plates were closed on the secondaries, not allowing any transfer signal. Now my a/f screws are responsive, when before there were no change in or out.

 

there's nothing magic about about that .020 deal. Just don't want to have the T-slot mostly uncovered.

 

thanks joe i might have to try that, i was also reading about the .020 square on the slots. im asumming you are talking about the low speed air bleeds?

 

tom already checked that out gasket looks good on intake and on carb, the intake is for a spread bore carb and the carb is square bore, purchased adapter plate from edelbrock which they recommend, i tried it with and with out adapter same result, as well as sprayed carb cleaner around the base to see if engine speed increased and nothing, but thanks for the advice

 

Jesse, I feel your pain. I'm going through the same thing with a 750 dp holley. I read up a bunch wednesday about the idle circuit and the transition slots have to be .020 square. If they are, then the air bleeds are to small for the idle circuit. They need to opened up to receive more air. I am by no means an expert from reading for a full day, but my 750 dp runs a lot cleaner tonight.

 

vacuum leak around the baseplate somewhere? turn the carb over, check the gasket that it covers the bottom of the carb properly. Then try the same gasket on the manifold, same check.

PCV and PB booster hooked up?