73 340 with 051 heads

after much flow testing on 340/360 heads, the stainless 1.88 valve flows very good, the port velocity stays up. velocity is way more important than big numbers. a 4 angle seat and 3 cuts on valve face will get you good flow and port velocity. the port was designed for a 1.88 valve. I've found flow loss and loss port velocity when 2.02 valves are installed. same thing on small block Chevrolet heads. just food for thought.