B16a cylinderhead development

intake shot of the ports 
worked the critical areas and textured the surface once shape is achieved

-guide boss shaped as to minimize obstruction in flow
-notice the contours/shapee leading into the port "throat"
 which then leads to the seat section , critical flow is gained and achieved here
 when done correctly

here's a better angle/picture to show the intake port work and all

-notice the outside walls (outer section of the port) and its shape gently
 bending towards the throat bigger is never better

-guide boss shaped visibly , and total removal of such would cause
 premature guide wear and loss of stability in high rpm's

-critical area such as the "splitter"  short side of the splitter and top (between guides)
 are carefully worked on , and contoured to guide flow into the throat of the port