Open Chamber Heads vs Closed Chamber Heads....

yellow rose said

None of those are actually closed chambered heads. And, the trend is getting the chambers even softer.

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I agree if we're talking power adder motors, but high output NA will have closed chambers. Here is a Chevy RO7 cup car head probably one of the best NA motor head made in the last 20 years. Looks like a tight compact chamber to me.