As for porting, Pocket porting is the most effective. Match the gaskets on the intake and exhaust. The area within 1" of the valves is where most performance is realized. Streamline the area around the guide into a teardrop shape facing toward the ports or round them leaving at least 18th inch material around the guides. The short-side radius turn on floor to port has a sharp edge that needs to be removed. Blend 1/2inch below the seats into the ports and smooth the turns.
Object not to enlarge improve flow remove sharp edges.
Most of the flow occurs at the top of the ports.
Think of a piston pushing or pulling.
In the ports themselves match to gaskets at the openings remove casting bumps sharp edges and polish the existing shapes.
Good for20-40hp on stock to modified engines.
A pocket ported gasket matched head with stock cam will run stronger than a factory head with a race cam.
1.94 1.6 Valves aren't needed look at the valve size on Ford 289 302 and the chevy 283 engines. About the same as this six.
