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It always had a rear tick sound for a couple seconds as soon as it cold started after sitting for a good 12 hours.
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Another possibility would be a worn lifter...it fits this scenario.
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replacing 1 quart of oil with auto trans fluid for a 500 mile cycle can "unstick" any "stuck" lifters.
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Don't do this. (Used car lot myth/old wives tale.) A worn/leaking lifter is worn & leaking internally, not 'stuck'. All you are doing with ATF in the oil is risking more damage. (ATF is 'high detergent' so it may help loosen/move sludge - but really, is that a good idea on an older engine? Or asking for trouble?)
Yank the valve cover, check for loose rocker, if all snug have helper crank engine watching the rockers for the one not moving like the rest - that's the bad hole.
Good luck.