The Tucker seat has an initial hardness of Rockwell "C" 42 that rises to 50 R/C + during the first few hours of running time. The material hardens during this period through the work of heat and valve impact against the seat. This increased hardness greatly reduces seat distortion and extends the life of both the valve and the valve seat.

The special Tucker alloy has a similar expansion rate of cast iron Heat transfer is also superior because the Tucker alloy is fully compatible with cast iron and does not form a heat barrier. Heat is conducted quickly away from the seat to the head, to the water jacket.

Each valve seat is individually cast using a process that, together with the special alloy, gives greater resistance to oxidation from fuel contaminates.  Unlike other seats, Tucker tungsten seats will not cause valve "pocketing" and recession.

Tucker seats cut cleanly and easily with existing tooling and will not clog the cutter or stones. These seats can be fitted using the same methods you are familiar with, yet offer a far superior performance. Tucker seats give your customers the best in quality and reliability, and provide increased profits!