With a 500+ horsepower potential out-of-the-box, these heads feature large volume, high-flowing 210cc intake ports and 0.130" raised 75cc exhaust ports. Heads with 60cc combustion chambers are available complete with valve springs for flat tappet or roller lifter applications. They feature CNC gasketmatched port entries/exits with blended valve bowls.
The spark plug holes and valves are in the stock location with a valve cover rail that's raised .150". Complete heads come with stainless steel. 1-piece swirl-polished under cutstem valves (2.05" intake/1.60" exhaust) as well as phosphor bronze valve guides. Valve springs handle valve lifts up to .650" on complete heads.
Rocker stud, intake and exhaust bolt holes are heli-coiled for strength -won't strip out like plain threads.
Note: May require enlarged piston valve reliefs to clear values. Photo may vary from actual product.