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Valve Seat Each Oversize Intake Nord & TwinSpark 47mm Valves
[605-79204-2]
$19.50 $17.00

These are special alloy* racing seats for all 8-valve twinspark engines that convert to 47mm intake valves.

The 47.75mm OD is 2.25mm larger than the 45.5mm stock seat.

  • Necessary for 47mm (2mm) oversize.
  • Not absolutely necessary for 46mm (1mm) oversize valves.

*Modified M2 Tool Steel, which utilizes a blend of three types of carbide materials to provide outstanding wear resistance for valve seat insert application.  Molybdenum and Tungsten carbides are both harder and more thermally stable than chromium carbides.  They also form a carbide structure to impart more stability to the base material.  Vanadium carbides are also added to provide greater wear resistance without affecting the machineability of the product.  This Iron based insert allows for excellent heat transfer.  T-series hardness run @ 42 Rc and is currently the industry choice when mated with premium or Inconel valves.

For more information about oversize valves and seats see section on "additional Prod Info"

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