What kind of materials are used to build a car engine that can handle very high hp?

What kind of materials are used to build a car engine that can handle very high hp?
What part of the engine? The block can be made out of aluminum and it would be strong enough for even the highest of HP engines, as long as it is designed correctly. Connecting rods can be made out of aluminum, steel, or titanium. Carbon fiber can be used but generally high cost prohibits the uses of it. Aluminum connecting rods will fatigue after time and will need to be replaced. Steel or titanium are prefered for most motors. Pistons are aluminum. JE pistons make good forged as well as billet racing pistons. The crank is usually made out of a good grade steel such as 4140 steel. I hope this helps