Reply to "compression ratio"

bosswrenchMember

To my knowlege, there is NO way to tell externally whether you have open or closded chamber heads. The various bumps, letters etc simly are undepenadable. However, if the markings indicate a '72-up manufacturing date, it DEFINITELY is not closed chamber since 4V closed chambers were only built 1970-71. These marks are under the valve cover.

6/29/0411:38 AM

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