I will be able to tell you what a ported ones flows in a couple of weeks. I have a flow sheet from a regular SOHC I have ported and the magnum will out flow it easily. my regular, ported SOHC flowed 185 cfm at .350 lift at 28" on the exhaust and 232 cfm intake at .350. The intake is the same between magnum and sohc. I have several to compare to at my shop.