wow that’s a tough question because honestly I wouldn’t run this head in this condition doing what I want to do. My Edelbrock, speedmaster heads take a bigger valve to get these numbers and having the flow numbers not back up. This is a great head but for making real horsepower I believe it’s choked. And with how the pushrod hole is formed it’s not tube-able like the Edelbrock heads. I can’t honestly give you a number on where it will end up till I find out how much material I have that a can remove. I don’t know where Larry Smiths starting numbers were but he claims to get 330 out of them.