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The patient - Mark IV LemansAge - 72,000 kms / 35 yearsVital signs - leakdown test about 8 % , compression test 125 / 127 psi , smoky exhaust , fuel consumption awful (and always has been over the last 25,000 kms) General health -running pretty fine, despite the smoky exhaust ! The Lemans is in need of a top end refresh - it's getting pretty smoky, which I assume is valve guides.I'm intending to have the valves K-lined. My question is how far do I go ?Given the compression & leakdown results are new rings are warranted ?While the heads are off, is it worth considering a port job, or dual plugging the heads ? How much benefit versus expense are we looking at ? (guzzi content)Thanks in advance from those more expert than me.Bazil