Do the mode, then grab a wide band o2 sensor, a multimeter, and then adjust the carb to ensure a lean out or over rich conditions don't kill your engine.
Some back ground.
Ford started converting 2100 2-bbls to annular discharge in 1966 for the California emmisions Mustang 289 engineds.
In 1983, the 600cfm Holley used in the 5.0 4-bbl HO engines got annular discharge venturis in the primary barrels. Result in each was a 15 cfm increase in flow in 2-bbl carbs, and 30 cfm more flow in the 4180 series carbs, up from 600 cfm to 630 cfm. This carb wasn't exclusive to the Mustang GT or Capri RS, but also found in , 5.8 and 460 HO engines in trucks up till about 1989 or so.
The 2-bbl Holley 2300 series has a vast array of versions, but basically the cfm goes up 15 to 30 cfm with annular discharge venturis. IHI and AMC versions often have a truck booster which is super restrictive, and same with the Economaster 8 leg booster found in some replacement Ford 2100 and 2150 carbs made by Holley.
As soon as the annular discharge mod happens, the main jet, idle air bleads and power valve settings are then out of calibration, and so thats why the aftermarket don't offer kits unless through some one who can make sure they aren't going to have to pay court charges for selling non approved parts for Holley carbs.
There isn't an annular discharge calibration for any 2-bbl Ford Six, but any Ford six with a 2-bbl won't have a calibration either on the Holley approved calibration list.
Do the mode, then grab a wide band o2 sensor, a multimeter, and then adjust the carb to ensure a lean out or over rich conditions don't kill your engine
