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I would imagine the port volumes are huge. With 400cfm, they would have to be. This probably wouldn't be the kind of head that you would want to run on the street. It would require a large cam duration to use the airflow.
Large ports, slow port velocity, and large camshaft durations equal less than desireable street manners....the equivilent of trying to drive a Nextel Cup car around town to get groceries.
I would consider using these, but it would be a very large displacement small block 445-460ci.
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