A10 Super Rocket and RGS inlet valve 1960 - 1963

A10 Super Rocket and RGS for engines from DA10R-101 onwards. 

BSA part number 67-1551

The valve stems are hardened by the pulsed plasma hardening process, which improves the resistance to wear and the anti-friction qualities by increasing the surface hardness along the valve stem, while retaining the inherent corrosion resistance of the material at the valve seat.

1.45" diameter, 3.937" long and 0.311" stem diameter.