SRDmotorsports

here's a better shot of the intake ports , some like shaping the entry to bias one direction or another
while some like to turn them to D ports,
i myself prefer looking at the intake ports as 1 part of the whole intake tract which includes the intake manifolds , and carburettors
and as such , it is shaped to correlate with the rest of the system
taking note that
1- flow will always be faster at the short turn radii (radius/bend) just like flowing rivers
2- having a larger "delta" between the speed at the short turn and long turn will cause fuel to drop
  out of suspension (lesser mist, more of a puddle) which isnt really good for economy and performance
3- different intake manifolds give different flow entry to the head's intake ports

the same shot with no lighting, just raw picture as it is to the naked eye

overall goal for the head development is :
improve torque (first priority)
flow well enough to have a healthy mid range and carry over to the top end (6-6,500rpm)
aid in keeping fuel in suspension (air/fuel mist) so that it doesnt rely on "fat" main jets  when tuned

next post will cover a lil more info on the engine itself