lifters have loud tapping noise
if you didht already destry the cam/valve train add >http://www.autozone.com/motor-oil-and-transmission-fluid/engine- additive-and-cleaner/zmax-engine-formula-lubricant/55716_0_0/
You can use that but I used Marvel Mystery Oil on my Isuzu that had noise you lifters started working in just under 10 minutes.
Lucas Engine Oil Stabilizer is also great to stop a valve tap.
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