Just follow the AFR engine dyno, but use the victor 5.0 intake or somethin similar to it. Those HP numbers possibly indicate that the AFR heads flow better than Westech had shown? Thats what I used to plug into my sim dyno?
Anyways, 280 cfm will support upto 540 hp if put together right.
300 cfm is kinda high IMO for that kind of power. To me thats like using a bozooka to waste a cockroach. 300 cfm will do the trick but your torques gonna suffer.
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