Shady dell speed shop shows a stock W2 head being just a shade (about 5 cfm average) ahead on the low lift flows down in the fat part of the valve opening, and the ported Edelbrocks start to gain a slight edge at the maximum lifts. The ported W2's show just how much more efficient the W2 port is from the onset... What works at low lifts continues to carry over to big gains at higher lifts, a rare quality in an inline valve wedge type head.
