i have this tapping noise from my top end....i have the HKS cams.....i remember when my motor went the dealer replaced some lifters..which i tought was strange having only 1000 miles on the car....any ideas what goes bad on the top end?common problems?...thanks

 

It's possible that lifters fail...but it makes me wonder if the person who installed your cams bled the liters properly at that time...

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