Those 3 14mm allen head bolts right next to each set of spark plugs (1 0 1- 1 0 1- 1 0 1, 1= spark plug 0= 14mm allen head inbetween the plugs) hold coolant. Do not take those out unless you have coolant in your spark plug wells. I've never seen or heard of those 3 leaking though, so I wouldn't worry about them.
The no.3 cylinder cover is a gasket so you can't just take it off without using either another no.3 cylinder head cover or oil drain plug gaskets.
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