Are Cylinder Heads 2843675 Open or Closed Chamber?

Dana67Dart said

I thought the only closed chamber heads were the 67ish 273 heads.

PLEASE correct me if I'm wrong.

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The 318-3 truck/industrial engines had closed chambers as well. They have a coolant passage instead of the exhaust crossover though.
casting # 234, 277 and I think there was one or two more but can't remember those numbers right now.