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7 For comparison, we tested a couple of aluminum aftermarket heads including the Stealth heads from 440 Source. The Stealth heads flow far better right out of the box than any of our stock cylinder heads, netting 258.5 cfm at .500 inch valve lift. The Edelbrock Performer RPM head is a favorite with many enthusiasts for the big-block Mopar, and these numbers show why. In stock form, the Edelbrock intake port flowed a best of 291 cfm at .600 lift, while the exhaust port flowed 232 cfm at .700 lift.