KDD 6.0 Powerstroke O-Ring Cylinder Heads, Pair Valve Springs:Competition - Stage 3 (120 psi) to our exacting specifications

to our exacting specifications

With a zinc coating that can lead to premature corrosion and zinc embrittlement

Simply put

which after frequent heat cycles can cause them to stretch

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KDD 6.0 Powerstroke O-Ring Cylinder Heads, Pair Valve Springs:Competition - Stage 3 (120 psi) to our exacting specificationsLead Time Applies Our popular O ring heads start off with a 100% brand new heavy duty casting made just for us, to our exacting specifications. We have improved several key design flaws with the factory cylinder heads KDD castings incorporate a higher nickel content and thicker deck surface, for a more rigid casting, and hardened alloy valve seat inserts (to prevent cracking of the valve seats like the factory heads are notorious for). Our 6. 0 heads