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Just been doing a little research on the oil consumption. The block is from a 72 TR6 #CC79173U . From what I have read the CC blocks are perfectly flat. The CR blocks have a recess around each cylinder. I was under the assumption that I have a recess in the block so I installed the head gasket with the little tab in the back. I have the other head gasket in my spare's I am looking for a little advice before I remove the head....