SBM Edelbrock/Speedmaster Head Data

Earlie A said

I have no idea where this is going. I'm still learning and trying to figure some things out, not the least of which is that irritating dip at 0.650" lift. Nonetheless, it was a productive week. Here's the results of about 60 modifications and flow tests. Thanks for the interest.

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View attachment 1716334997

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IMO at that lift you are dealing with a seat/chamber issue.

How to address it is the question.

The 50 degree valve job certainly takes a bigger hit up there.

Have you tested the ports just like they are at the highest pressure your bench will pull and then say maybe at 10 inches and see what those curves look like?

That may get you going in the correct direction.