TQ guys - sec jet mod

I’m not sure but 1/4-28 is a standard size. 1/4-32 is not as as far as I know. I’ve never seen or heard of a 1/4-32 tap.

Take a piece of scrap steel, 1/4 inch thick will do and drill #3 hole and tap 1/4-28. See if the jet screws in.
From Holley themselves.

https://www.holley.com/products/fue...mponents/jets_metering_rods_bleeds/main_jets/