It could be and probably is a lifter. You may want to investigate a bad valve guide though. Do any of your plugs have oil fouling to any degree? (Oil on a plug could be ring wear too.) Even if not you may have enough guide wear to make noise. A mechanics stethoscope may help you track it down. If you are running 1.7 rockers it will increase guide wear. In any case, good luck.
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89 LX Coupe
93 LX Coupe (Bone Stock)
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