Series 60 Intake and Exhaust Valve Arrangements

Four valves per cylinder, two each intake and exhaust, give the Series 60 engine excellent breathing and cooling characteristics.

Valves are made of heat-treated alloys, with heads and stems precision ground. Stem ends are hardened to minimize wear in contact with the valve rocker buttons. ‪

Hard-alloy valve seat inserts, pressed into both intake and exhaust ports, can be replaced when worn to restore new engine performance. ‪

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