Seat, Powdered Metal, 1.757” OD x 1.375” ID x 0.450” THK, Various HD® Applications

Harley-Davidson® Evolution 1984-1999
Harley-Davidson® Sportster 1957-1969
Harley-Davidson® Sportster 1970-1983
Harley-Davidson® Twin Cam 88" 1999-2004
Harley-Davidson® Twin Cam 88" - 103" 2005-2017
HD® XL™ 1100cc 1986-1987

In an effort to develop valve seats that would meet our exacting standards, KPMI® tested and chemically separated several iron based valve seats. Eventually we specified a combination of materials that gave us a seat with good uniform hardness and resistance to microwelding, wear, and recession. Casting a seat with this combination of alloys is not possible. Only with the latest in Powdered Metal Technology were we able to blend these alloys, creating a high density seat with exceptional wear resistance, machinability, and thermal qualities. This material is compatible with all types of fuel blends, resists corrosion and burning, and is machinable with standard tooling. These seats have been thoroughly tested on the track and street, in high RPM multi-valve applications, high spring load V-twin applications, with leaded and unleaded gasoline, ethanol, methanol, and in naturally aspirated and forced induction applications. In each case they have performed flawlessly, making these the seats of choice for cylinder head builders everywhere.