Also I saw on cr machine that there are different spark plug pitches, fine 1.0 and coarse 1.25. What is the right one for ngk spark plugs? In case other brands have different pitches too so I know which one to look out for.
Yeah I'll wait for his response. I want a high comp head mostly for its cooling. But performance is nice too. I could use more mid range power, some top end too, but mostly mid.