Port velocity average target fps?

chad speier is in that top 1% club of head porters/engine builders. His work speaks for itself. That being said, 1.67 torque per cube is astronomical, very few folks can reach those numbers. If you can, you are gifted. The R&D needed is overwhelming. Those are the guys that grind and dyno 50 or more cams for their race engines. David Vizard says most really good engine builders reach 1.45 tq per cube.

David and Charles servedio both strive for 300 fps in a performance street strip engine. When checking air speeds, it is done in 5-6 different areas in the port. Remember there is no such thing as perfection as you are always porting a head as cast. The port has to go around bolt holes, pushrod holes and water jackets. Unless you are casting custom heads, you have to work with what you got.

Then you have to figure in intake manifolds and carb/FI. You wouldn’t believe how much all single four barrel manifolds choke flow.