MODEL 18, 19 & ES2, INLET & EXHAUST VALVE

TOP QUALITY, UK MADE.  FITS ALL NORTON 500CC OHV SINGLES (NOT THE AMC ENGINES USED IN THE SIXTIES).
CONCAVE HEAD AND UNDERCUT STEM DIAMETER IN THE PORTS IMPROVES FLOW AND COMBUSTION.  PULSE PLASMA NITRIDE COATING AND SUPER POLISHING REDUCES FRICTION AND WEAR ALLOWING FOR A SLIGHT INCREASE IN THE STEM DIAMETER IN THE GUIDE WHICH HELPS TO REDUCE EMISSIONS AND REDUCE OIL CONSUMPTION WHILST IMPROVING COMBUSTION. 
UK MADE.  STELLITE WEAR TIP FOR ROCKER.  (VERY STRONG AND DURABLE).

LENGTH: 4.35"
STEM DIAMETER NOMINAL: 3/8"
HEAD DIAMETER NOMINAL: 1 3/4"
COLOUR: BLACK
WEIGHT: 100 GRAMS
MATERIAL: EN214N