Block Crank shaft Connecting Rods Piston Valves Heads

What's in an Engine & Why? Heads Heads are similar to the engine block. They support internal components and transfer heat to the ambient. The material for engine heads vary from aluminum alloys to cast iron. Cast iron heads are of the SAE G2500 grade gray iron. In the case of aluminum heads a thermal resistive alloy is used, usually 356-T6 or A390 heat treatable alloys. It is important to choose a thermal resistive alloy to prevent the condition known as warped heads. Warped heads are caused from uneven thermal expansion and contraction.

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