Heads for 440

PRH said
The thing that many don’t understand is, it’s not a guaranteed fixed gain between those various heads.
The milder the build, the less the demand placed on the induction, the less difference you’ll see with better heads.
The opposite is also true. The higher demand on airflow……the more the better heads will pay off.

I understand, just using the difference between each head as a ballpark. I am hoping that between the closed chamber design and small bump in compression, better quench, more flow, and the weight loss in the front end will all lead to better performance.