I and several other Holley Carb Modifiers actually convert the Carbs with the IFRs at the top to the bottom location as it works a lot better.
Holley moved the IFRs to the top because some people had idle issues with the carbs when the 5th hole (lowest was used). so people have 5 holes and if a little emulsion is good, more is better or so they think. So they do the E-hole #1, Plug #2, e-hole #3, plug #4, E-hole #5.
A much better situation is to Plug 1,3, and 5 holes and use #2 and #4 emulsion position holes (like the old metering blocks had), and move the IFRS BACK DOWN TO THE ORIGINAL POSITION AT THE BOTTOM OF THE METERING BLOCK VS THE TOP POSITION.
So that is why I have not posted on that "mod" because I only recommend things that actually work like they are supposed to work.
The old 2 hole emulsion metering blocks work great as does the low position IFRs except they are not pretty like billet 5 holes $$$ metering blocks that the NASCAR guys use for a specific reason. Fuel Mileage.
Tom V.
I worked on a NASCAR carb one time that had 10 Emulsion holes in a single metering block.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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