KDD 6.0 Powerstroke O-Ring Cylinder Heads, Pair

KDD 6.0 Powerstroke O-Ring Cylinder Heads - Pair Cylinder Heads Feature: Track tested, proprietary O-Ring setup. 32 Tungsten Carbide hardened valve seat inserts to prevent cracking. 32 press in iron matrix valve guides, honed to size for superior lubrication retention and ultimate longevity. Upgraded heavy duty casting, thicker than OE. Pressure tested and vacuum checked. Blueprinted to proprietary valvetrain geometry, to alter valve height and valve recession for maximum reliability and longevity. New USA made high quality valve springs, retainers, locks, valve stem seals, freeze plugs, glow plug sleeves and injector sleeves. Valve spring pressure is tested and balanced ensure consistent spring pressure across all valves The same industry leading O-ring design survived Diesel Power Magazine’s DPC torture test, claiming victory in 2016 and 2017. No core charge or return shipping as cylinder heads are 100% new. Description:  Our popular O-ring heads start off with a 100% brand n