Joe69z28

I would like to know what section of the port opening has the greatest flow and velocity to the valve seat.

A.R. Shale Targa

iTrader: (2)

google (Sperry brothers gen III design).................

wannafbody

iTrader: (2)

The bowl design determines flow to a large degree

slogo

Can you explain in your own words what this means please.

wannafbody

iTrader: (2)

As I read it, that's where the majority of the improved flow comes from compared to a stock head, either aftermarket or ported. in the case of a stock head, removing the swirl port and enlarging the bowl and smoothing it.

99 Black Bird T/A

iTrader: (4)

Some of it depends on the application the head is ported to support. The short side radius is frequently different from drag race heads (usually no wing in intake port) and road race heads (often have wing in intake port). Part of that may relate to keeping fuel suspended if using a carb.

I will see if I can find some pictures...

Joe69z28

Let me rephrase my question and be more specific . Im not asking how to increase flow or where to . My question is what section of the port Entrance has the greatest flow and velocity . From the entrance section and its path to the valve seat ? I have divided the port into 3 sections Upper is above Blue line , Mid above red line to the Blue line and Lower section below the red line to the floor.

wannafbody

iTrader: (2)

I don't think there is an answer to your question because you can't flow test half or third of an intake port. The short turn radius is important, bowl is important and port volume to support your engine with good velocity. Too big of a port slows down airflow.

tug686spd

iTrader: (11)

The roof or top of the port is where most gains are made, above your blew line. Some of the best performing heads have the floor or bottom of the port epoxied.

A.R. Shale Targa

iTrader: (2)

The LS cylinder head was the first "clean sheet" design to work/flow WITH the intake manifold.....hence why I said to read up on the Sperry brothers
The injector location took priority, then the port shape came from creating as much volume as would fit between the push rods.
The engineers had dozens of air speed sensors in all kinds of areas of the intake tract, so they could accurately tell you the velocities and what not.
Their basic principal was to start with the largest cross sectional area at the lip of the intake runner then gradually reduce the CSA in order to speed the air flow and create both tumble and turbulence (and not too much of either)
All newer LS designs continue to raise the floor which straightens out the tract, as flow out the bowl/past the valve is where it's at.