Top quality made in UK inlet valve Plasma hardened, to suit A10 alloy heads, Road Rocket, Super Rocket and early Rocket Gold Star.
Valve is hardened using the "Pulsed Plasma Nitriding" process, this gives the valve resistance to wear and anti friction properties, when this type of valve is matched with our Colsibro material valve guides, you have the best combination for valve and guide, for performance and longevity
