SBM Edelbrock/Speedmaster Head Data

Earlie A said

That is something I need to try. I've seen pictures of a tubed bolt boss protruding well into the chamber. I think Brian even posted one here a while back.

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The nice thing about the W5 is it doesn’t break through so no tube.

If the customer pays for it I tube the SM heads and the other chicom stuff.

It’s been my experience that having even a small bump like that will get you air buffeting off of it. It forces air away from it.

As air speeds go up and the air is attached to most of the port it makes the port (air column) much smaller there and it speeds up.

Once the air starts separating from that bolt boss…I think you know what happens next.

I always shoot for the least cross section changes I can get.