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If it has stock pushrods then disregard my suggestion, stock rods hitting would be VERY unlikely. Probably time for lifters and cam bearing as others mentioned.
+10 on the ev27 and adjustable pushrods, you wont be dissapointed.
Nothing but earlier we were talking about cams and it was on my mind. I've been needing to do the bearing and now's a good time to do cam, lifters and push rods.