I've been using these heads for about a year. In my setup they produce tons of power from 2400 to 5500 rpm. The motor design is the same: power stroke from 351w to 408, shaft ratio 1.5, compression 10.5:1, 449601 pickoff, roller cam, roller rocker arm. Manifold and dual 2.5" exhaust 2400 on a c6 in an 82 bronco with 35.
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