Check the head surface, making sure it is flat, and not warped in the center.
Hi Johan,
also check that the head stud threads are clean and that the nuts can be screwed on all the way down easily.
When installing the nuts, put a drop of oil on each stud thread and torque to specification.
After the first start re-torque the nuts and then again after about 10 starts. These old style multi layer gaskets are known for compressing down and the nuts loosening off.
Cheers,
Eddie B.
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