Thats what provoked my question and what started it all was several years ago when it came out that the Holley HP 950 was closer to 850 cfm. I see carbs rated at 1050 but wonder how many of them really are and that includes Holley.
The original Holley # 80496 950 CFM rated didn't flow close to that number, I had several of them flowed, they all flow under 900 CFM
I haven't had any of the newer Holley HP flowed but I believe when Quicf Fuel came out with their version of the HP type carbs that did flow as advertised Holley had to keep up
The early HP carbs., including the HP950, worked great out of the box, including the replacement HP Dominator carbs. with the smooth tops
Not all the Holley race carbs. work great out of the box, same as other brands like Barry Grant, Carters and Edlebrocks
