Douglas,
that is one way to make a manifold.
Mighty 6's velocity stacks are long & tappered.
So it is bigger @ the top of the runner & gets smaller as it gets closer to the intake port on the cyl head thus increasing velocity.
Here is a better design,,,well sorta :
http://www.sdsefi.com/techinta.htm It is supposed to be better if you make your velocity stacks protrude into the plenum area.
But the pic shows a bad velocity stack,the top should be curved more for a more full radious.
More like this
http://www.gravesport.com/cgi-bin/shopper?preadd=action&key=AB__003 Mighty6 has the correct idea,that is why I wanted his brother to make me the same type of velocity stacks,picture perfect!!
http://www.mighty6.com/pics-sept-05/DSC00005.jpg MBHD
