Lotus Twin Cam. Exhaust Valves 1.375 or 1.4 Stainless Steel Race. We stock these in two lengths which suit most heads and applications, they feature a head size of 1.4in (35.5mm) with a standard stem of 5/16inch diameter. The valves have a standard single groove. They are made from stainless steel and have "necked down" stems.
