spoonage

Hello,

I know there has been alot of guys already asking about this but mine is slightly different. My B16A starts tapping after 3000rpm till 4000rpm, before that it taps but you can hardly hear it, after 3000 it sounds like marbles were dropped in there. I have changed the lifters, adjusted the valve lashings, used thicker oil, adjusted timing, but nothing works. Does anyone know what else I can do.

Thanks heaps