Heads up runs in Stock & Super Stock

[Dan Fahey]

Originally Posted by Ed Wright

Carburetors are not rated at that high of a test pressure. Raise that, cfm goes up.
Flow a 750 cfm Holley or Quadrajet carb ar 28", it will show MUCH more than 750 cfm.
28" is for cylinder heads.

28" vacuum is standard = 1.01 lbf/ inch squared

[Ed Wright]

Originally Posted by Dan Fahey

28" vacuum is standard = 1.01 lbf/ inch squared

It is the standard for CYLINDER HEADS! And, not all shops even use that.

When did you get your first flow bench? Over 30 years ago here.

2 & 4 barrels carbs are not even rated at the same depression.

To compare them to carburetors, they would have to be flowed at the same depression.