B60 engine
Chris,
I have had a lot of experience both with Ferrets and Rolls B series engines and would have good guess that the head is bowed and requires refacing. Also, the head gasket requires rechecking after running. As its a copper /asbestos gasket, I prefer to use Wellseal sealant (originally,a RR formulated product), a kind of shellac.
There are a small number of nuts that you may not be able to use a torque wrench / socket on, these are along the edge of the head, spark plug side, it may be that these are not tightened as much as the others.
Richard
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