A10 RR, SR and RGS exhaust valve 1956 - 1963

Exhaust valve for A10 Road Rocket, Super Rocket and Rocket Gold Star 1956 - 1963. 

BSA part number 67-967

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.

Head diameter 1.38", length 3.94", stem diameter 0.310"