kibblewhite stoel vlv gietijzer 35 mm 10 sc350Premium Valve Seats for Applications Using Steel Valves, A Specific Combination of Alloys Allowed A Creation of a High Density, Iron Based Valve Seat With Uniform Hardness, Exceptional Thermal Qualities and High Resistance to Wear and Reusion Caused Caused Caused In powdered metal technology were we abblem to blend these alloys to give a seat material with the Qualities Required for Today's Engines, These Seats have been tested on the track and street