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The Stage V Engineering Hemi Conversion heads share all critical details with Chrysler 426 Hemi heads but are cast to accommodate the specific oiling, head bolt, and pushrod placement features of the wedge block. They're sold minus valves and springs but do include conversion-specific rocker arms, shafts, and stands. We fleshed them out with Manley valves, springs, cups, retainers, and locks. Spring pressure is 205 pounds on the seat and 560 pounds at 0.688 lift to suit our solid roller cam.