Originally Posted by mopar dave
... Also their is word out there that the Holley ultra xp line is not so good...

Like a lot of off-the-shelf carbs sold today, their calibration may be "less than optimal" for what they get put on.

This one doesn't suck as much as it used to, after a combination of work by AED and myself.

Holley 1.58 Ultra annular 1.jpg