Highest flowing sbm heads?

Mean416 said

I don't know what I have said or done to you to make you upset towards me. Anyway what I've learned from you is, there's no cylinder head north of 320 cfm to be had for a sbm.

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I just listed two above for you. Here’s a short list

W2 in the right hands
W5

W7
W5
W8
W9
Gen 3
Edelbrock with the pushrod moved
Nascar stuff

To name a few. Pick your poison and your favorite head porter.