Originally Posted By: TheSilverBuick
I
I've been experimenting and practicing on hammering a curved entrance to the port. It'll never be perfect, but I'll see what I can do. My airflow friend says a 1/2" radius is as close to ideal as a curve would get for airflow, so it gives me something to shoot for, but I know it'll come up a bit short.
An easy way to get the entry radii near perfect is to make a hammer forming die. Look at the last runner to the right side of the picture. There is a radius hammerform die made from scrap 1" diameter tubing welded in the shape of the entry window. You can use it to hammer out all the runner entries the same:



FORD 300 inline six - THE BEST KEPT SECRET IN DRAG RACING!