A10 Super Rocket and RGS oversize inlet valve 1960 - 1963

Oversize inlet valve for A10 Super Rocket and RGS 1960 - 1963, a 1/16" oversize version of 67-1551

No BSA part number

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 1.515", length 3.937", stem diameter 0.311".