Stainless Steel Intake Valves 

Stainless Steel Intake Valves

These valves have become the standard upon which all marine heads are constructed. If someone is telling you they have a valve just as good or better than a Manley Inconel valve "Beware". There's a reason they are the choice of real marine engine builders and cylinder head manufacturers, no other valve has the ability to make the claim of having over 1,000 times the fatigue strength of other competitive valves.

Note: This one part in your engine quite possibly takes the most strain of any given part in your engine.