I agree with Mollydog, except I prefer to drop the hot copper into cold water. It is how I have annealed copper headgaskets since 1961. So far so good
take good care to tighten gently, I like to assemble things with grease, when a cover starts squish out the surplus ( nearly all of it) you will feel the bolts get stiffer to turn, generally a flat or two from there is enough.
head bolts need to be reasonably close to the setting. Using a torque wrench see how few fingers hold is necessary to get to the right pull. ( make allowance for length of handle and the length of your spanner).
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