Yes, you can. But, if you find the primary chain is knackered and has been attacking the internal oil gallery, obviously replace that while you have it open, but then you need to remove the crank, which can be done without removing the head, although you will need to remove the rockers/cover as well to release the camchain in order to get the crank out, and for the small costing the scheme of things, replace the camchain as well. Probably best to get a full gasket set, just in case you discover further horrors inside that may need the head off as well.
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