ATM/Holley verses Carter 625 AFB

A 1.420 x 1.750 carb with a modern chokeless main body would be closer to 850cfm.

Carb flow testing - Don Terrill’s Speed-Talk

The real question in my mind is…….how does the ATM carb compare to another similarly sized, “known good” carb.


I’ll read that in a bit. I figured about 830ish. The ATM beat my true 750 dyno carb by 15 or 18, but like I said I need to do more tuning on my carb but I’m not going to do it because I’ll have to undo it for my stuff.