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Here is what Edelbrock has listed for the 500cfm AVS knockoff, with single and dual quad listings. That's the way I set my 4966 carbs up with, the engine doesn't go on the dyno for a few weeks. We'll see how close they are then.



Edelbrock has the primary and secondary jets mixed.

Larger jets go on the primary side.


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#1803/#1804 are calibrated for dual-quad applications and factory equipped with: Metering Jets -Primary .086, Secondary .077 ; Metering Rods - .065 x .057; #1804:Metering Jets -Primary .086, Secondary .077 ; Metering Rods - .065 x .052; Step-Up Spring - orange (5" Hg).