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  6. Wildcat 223 - Evolution Performance Cast Head & Components
The Evolution is the only aftermarket cylinder head designed as-cast for open racing small engines. In other words, the cylinder head has raised ports with a larger cross-section for the intake and exhaust. The EVO uses 33/27mm valves with 5mm valve stems. It's the only head that doesn't require additional machining for larger valves or porting.

What you need to know about the EC Evolution Head:

- 33/27mm Valve with 5mm stems
- The stock intake and exhaust bolt pattern are the same as a stock head, but your components will need porting to match the cylinder or opt for EC's billet intakes designed for the EVO head. 
- The Evo is a cast cylinder head that is very close to the same size as a stock head, unlike many of the billet heads on the market. 

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