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Which Dominator(4500) carb and how new is it? A lot of the newer Dominators have air valves in them around the center were the air cleaner stud is. The valve could be open to far letting too much air to bleed through, in other words a large vacuum leak. On my older Dominator, I had to drill and...

In your initial post you said that the afr leaned out one full ratio across the board, So if it was my carb the first thing I would do is up the main jets 2 sizes all the way around ( if I remember right 4 jet sizes is one afr ratio). While you have the metering blocks off for jetting, up your...

If you have fix air bleeds and the idle circuit is rich try putting a small strand of wire bent in an L ( a single strand from a 14 to 18 ga. wire) in the idle feed restriction in the metering block until you achieve a 14to15 AFR (go with a thicker strand to lean thinner to richen). If it is...

I would not say these are bad carbs they tune just like any other vacuum secondary holley just have some odd parts on them that are hard to find.I ran one on my 416 with stock jetting for a year and a half before the diaphragh went bad, the carb worked great and the jetting was on the money.

A metering block conversion WILL NOT WORK ON A 3 BARREL HOLLEY! If it is a 1050 it will have dump tubes in the secondaries a 950 have dog leg boosters, ether way holley moved the tubes and boosters inboard about a 1/4 inch on both sides and they moved the air bleeds too. There is a special plate...