I had my head cleaned up with new valves, guides and a valve job. It was put on the engine and now it is horrendously louder. The spings are only 8 months old. I took the head and parts to the head work shop with parts in a box. They assembled it there. Is it possbile that they mixed up some of the valve springs. Lash has been checked countless times and is perfect.

Thanks

 

as in mixed up I mean between the intake and exhuast valves. BTW it is an A6