Do as specified by Haynes.
You should be aware of the the tappets may expand some when out of the cylinder head. In many cases, the tappets have not collapsed sufficient after installation due to internal "gunk buildups", making the valves not closing properly on the initial start up and making the engine runs pretty roughly due to lack of compression on one or more cylinders. In most cases, the tappets will settle quickly under the first warm-up and make the engine run smoothly again.
Just a nice thing to have in mind....
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