When it comes to 6.0 Powerstroke reliability, nothing compares to KDD’s battle-tested O-Ring cylinder heads. Built from the ground up with all-new castings and machined to exact specs, these heads are designed to put an end to the common failure points that plague factory 6.0 heads.
Proven O-Ring Design – Virtually eliminates head gasket failures with KDD’s proprietary stainless O-ring setup.
Reinforced Injector Bores – Built stronger to prevent cracks and fuel/coolant contamination.
Hardened Valve Seats – Alloy inserts resist cracking and increase longevity.
Heavy Duty Valve Guides – Iron matrix guides, diamond-honed for durability and proper oiling.
Stronger Deck Surface – 25% thicker than stock for superior gasket retention.
Blueprinted Geometry – Proprietary valvetrain setup for correct valve recession, reliability, and long life.
Fully Assembled in the USA – With new high-quality valves, springs, retainers, locks, seals, sleeves, and plugs.
No Core Charge – 100% brand new castings, ready to bolt on.
Proven Performance – The same O-ring design that helped KDD claim back-to-back wins at Diesel Power Challenge 2016 & 2017.
KDD’s O-Ring cylinder heads start with a 100% new heavy-duty casting—built exclusively to their specifications. Unlike OEM heads, these are engineered with a higher nickel content and a thicker deck surface for maximum rigidity. Known factory weak points are eliminated: injector bores are reinforced, bolt holes are strengthened, and hardened valve seat inserts prevent cracking.
From bare casting to finished product, every machining step is completed in-house on precision CNC equipment, ensuring exact tolerances and consistency.
Head gasket failure is a common issue on the 6.0 Powerstroke. KDD’s O-ring solution solves this by machining a receiver groove into the deck surface, then pressing in a USA-made stainless wire. This wire protrudes slightly, applying extra sealing pressure across all layers of the MLS gasket. Unlike copper or softer materials, KDD’s stainless wire won’t compress or deform, and it’s reusable if you ever pull the heads again. Best of all, these heads work with standard off-the-shelf gaskets and don’t require block machining—just clean, dry, and flat deck prep.
The valve guides are precision diamond-honed with a crosshatch finish for oiling and long service life. Each head is hand-assembled to blueprinted specs with USA-made components—valves, springs, retainers, locks, seals, injector sleeves, and glow plug sleeves. Unlike factory crimped valve seals that tend to fail, KDD uses bonded-style valve stem seals that stay put under high boost and heat.
Every set of KDD heads ships ready to install—no cores, no downtime, and backed by a 12-month replacement warranty against defects in quality and workmanship.
✅ Perfect for towing, daily driving, or high-performance builds.
✅ Proven on the street and the track.
✅ Trusted by serious Powerstroke enthusiasts worldwide.
$3,499.00
$242.30
$132.00