I actually flow tested a bone stock 4V head with and without the ports. I've been using them, and they seem to work fine. The best use is for a reusable intake gasket. I can send you the flow data, but the short story...they slightly increased flow across the range. I stopped at .600 lift. Flow velocity must also increase, as the port is actually narrowed. So, they do not hurt and probably help. --Dan H
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