might be head gasket/warped block/warped head. I'd have your machinist check the block deck for flatness, same with the head. I've never seen an unported 906 that was cracked but I have not worked with an abundance of em so you could very likely be an exception to my (limited) exp in that area. Wouldn't hurt to check long shots like thread depth while you are there. Holler how it goes.


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