Because it’s industry standard now. The IFR MUST have a head over it or idle AFR is horribly unstable.
Just like power valve timing and tuning, it’s been wrong so long they just keep doing it.
As an aside, I installed a new Brawler on a guy I went to HS with today. I said don’t bolt it on until we look at it.
Brawlers were notorious for high IFR’s, massive emulsion and some crazy bleed sizes.
I was more than surprised that this carb (5 days old, fresh out of the box) had an .028 IFR and it was LOW (that’s a bonus for my fat hairy *** as its way less work if I don’t have to move them) AND it had 2 emulsion holes at .028, not like some of them with 4 emulsion holes all wide open and .032 holes.
I didn’t get to do a deep tune on it, but when his BBC goes in I’m going to dyno and tune it.
So maybe Holley got their collective butt out of their *** and made a production change.
If they did that makes the Brawler an even better deal.