First, do you have good o-rings on the center bolt? If not, chances
are you will have much less noise after you replace them.
However, a new head gasket (and new head bolts) isn't a bad idea if
you don't know when the last one was done -- they DO leak, and a low
compression injector knock sounds a lot like a bad tappet...
A compression test is the cheap and cheerful way to decided -- if you
have a few low but not bad cylinders, especially if they are
adjacent, suspect a bad gasket.
Note that a failure at the cross passage in front of #1 will cause
excessive oil consumption and the scary possibliity of oil
hydrolocking the cylinder, with attendant thrashed rods and crank.
Peter
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