I got rid of my lifter tick when I switched to syntetic oil.  otherwise it depends on how bad the tick is.... for the average joeschmoo thats probably too loud. and always try to talk them down.
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86 GMC Jimmy Blue and Silver- R.I.P.
87 Integra RS ~228k miles R.I.P. 
92 SVX LS-L Perly ~186k R.I.P.
89 240sx se red ~165k miles Gone and unknown
89 240sx se Black~185k R.I.P.
85 Toyota pickup ~205k R.I.P.
85 BMW 325e ~ Gone and unknown
85 Ford Mustang getting engine swap now!
05 Colorado ~108k Daily Driver
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