adjust tapped

[kansaiPAQ]

hello guys,
is there anybody know what is the tapped clearance for civic sr4 1.6?i m willing to adjust the tapped due to noisy came out from the head,n the power felt decreasing a bit before than this.how to do better to increase the pick up and the high end?

 

[flushafteruse]

better u get the factory setting spec b4 ure done it....