gti6 high rpm flat spot

[aaddzz123]

I see! I've never dealt with hydraulic lifters before. How would I be able to test them to see if they're worn out?... The engine has recently been built apparently due to the belt snapping for a second time. He claims to have changed all the valves and used a 1mm thicker gasket incase of any clearance problems with the valves but I have no proof of it... A friend of mine said that most of these engines tap after being rebuilt. Is that due to a common mistake during the build or just cutting corners and reusing damaged valvetrain? I'll do a search for tapper now. And check the timing tomorrow.

Cheers !