KDD Delta Series CNC Ported 7.3 Powerstroke O-Ring Cylinder Heads Features & Details: NOT IN STOCK - LEAD TIME APPLIES - APPROX 4-8 WEEKS LEAD TIME Track Tested, proprietary O-Ring setup. 5-axis CNC ported intake and exhaust runners, machined in-house Riff Raff Stainless steel injector cups installed standard — eliminates brass failures Stainless nitrided valves, heavy-duty valve guides and seats - standard Competition-grade beehive valve springs for improved stability and durability Designed for bolt-on compatibility with factory 7.3L configurations All heads come O-ringed, standard - works with factory or Cometic style gaskets. Fire Rings Available upon request (note-fire rings require special install instructions and require multiple hot retorques. The standard O-rings have been proven to 800+ hp and don't require any special installation or hot retorquing of the head studs). Description: Engineered to breath new life into the 7.3 Powerstroke! Kill Devil Diesel’s Delta Series CNC Ported Cylinder Heads bring modern airflow engineering to the classic 7.3L Power Stroke delivering massive gains in performance, drivability, and reliability while retaining OEM casting integrity and factory fitment. We started with genuine Ford castings and applied the same proven engineering approach behind our industry-leading ICON Series heads. Every port profile was developed using CFD (Computational Fluid Dynamics), refined on our SuperFlow SF-1020 flow bench, and validated with DynoJet 224XLC testing. The result is a clean-sheet port design inspired by the high-swirl, high-efficiency architecture found in modern diesels like the 6.7L Power Stroke and 6.7L Cummins. Named in honor of the elite U.S. Army Delta Force, this series reflects the same values that define those operators: precision, discipline, and reliability under extreme conditions. While our mission is vastly different from theirs, the standard they represent is one we deeply respect and strive to reflect in our craft, we aim to bring that same level of intentionality and execution to everything we machine. Performance Gains (Setup Dependent): Up to 50+ horsepower and 125+ lb-ft of torque real world gains with supporting modifications (KDD Camshaft, upgraded turbo, inejctors...ask about our power packages) 40% increase in airflow over stock Lower EGTs, quicker turbo spool-up, and crisper throttle response Precision laser scans of factory castings allowed for 3D modeling of water jackets and ports, allowing for total control of wall thickness in critical areas for the durability and dependability 7.3's are known for. Whether you’re building a performance street truck or a competition setup, the Delta Series heads are engineered to take your 7.3 to a level it was never meant to reach; until now.