just realised i am reading jem0002. earlier version.
hows this for confusing. the list of sealants and lubricants recommends nickel for the head bolts then you go to the maintenance section and they recommend copper for the head bolts.🙂
loctite Nickel Anti-Seize is copper free. Recommended for stainless steel and other metal fittings. For preventing corrosion, seizing, and galling in harsh, chemical environments, and temperatures to 2400 °F (1315 °C). Used on cylinder head screws.
If the engine has been operating in a corrosive environment (such as coastal areas) it is possible for the cylinder head screws to rust in place. In this scenario it may be necessary to periodically removed screw one at a time (do not remove all at once), check for rust (substantially corroded screws must be replaced), and apply copper anti-seize before reinstalling to the torque setting.