The Lexus ES350 Cylinder Head is the chambered top of the V6 engine that seals off combustion, provides a route for fresh air fuel to enter the engine and for exhaust to exit the engine, allowing for ease of power and preventing leaks. Built with Lexus lightweight aluminum engineering instead of heavier cast iron, this Cylinder Head reduces mass, sheds heat quickly and allows for higher compression for strong but reliable performance. Its internal passages house spark plugs, valves, guides, seats and springs, all designed to minimize airflow restriction in order to make the ES350 breathe freely and make more horsepower. This Cylinder Head architecture is clamped with torque to yield head bolts that stretch to their yield point and apply an even pressure to keep the head gasket tight and ward off any crossover of coolant or oil that could otherwise trigger overheating or misfire. Over time, guides or valves can wear and a warped or cracked Cylinder Head can develop combustion, coolant or oil leaks and a blown gasket between cylinders can drop compression. Keeping the bolt integrity and gasket seal intact therefore is vital for every Lexus ES350 owner. Earlier and later ES350 models share the same basic aluminum twin overhead cam style, so no radically different types exist, yet reinforced port areas allow contouring without breaching water jackets, preserving the durable yet high flow character expected in a Lexus performance sedan Cylinder Head.
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