SBM Port Molds

Earlie A said
Here's some pictures you might find thought provoking. These are side by side intake port molds of an OOTB SBM Edelbrock RPM head and a Trick Flow 190. Also a pic of the TF intake bowl. I was a little blown away by the bowl design downstream of the guide on the TF. Looks like this design is one of 3 things, or maybe a combination.

-Fuel shear ridge
-Swirl inducing (or swirl canceling because of the direction)
-A fix (or band aid) for the flow stall that happens after the venturi convergence point of 0.500 lift

I really don't know the answer, but I hope to find out. I'd love to get the facts, but opinions would be interesting as well.

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Take a piece of string and stick it in the port while it’s on the flow bench. You can see exactly what they are doing.

They layer the air as it comes around the long side. They are trying to force the air around the valve on the chamber wall side, and the other side of the valve guide is trying to get the air to bend around and come over the short side.

I’m not a fan of doing it. I think there are better ways to get the air around the chamber side of the valve.

Try the string thing. You can see where the air is going.