I had 30 thou shaved off my 4k head to raise compression. So i put it all back together today but now there is a really loud tapping that sounds like its coming from the top end its, not valve clearance or the rocker gear because i adjusted the clearances until they almost had no gap at all but it wouldn't go away so i put another rocker gear in and still the same I'm thinking maybe because of the head sitting lower the push rods are on a different angle that makes them noisy but I'm not sure what do you think?