Trick Flow SBM Heads

B3RE said

A larger valve without reworking the port would tend to make the port less efficent, even if it gained a couple numbers in flow. Once the port velocity goes sonic, it doesn't matter how big a valve you put in, it isn't going to flow any more air. The port has to get bigger.

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Our buddy Tim has a set and wants to bring them over and do some testing one of these days on my flowbench. I didn’t take any measurements when I went over to see them at his shop but I did notice that the way they machined the pushrod holes it wouldn’t be as easy to open them up as they are on an Edelbrock Head. But without seeing what the airspeed is at the pinch it my be a non issue.